diff --git a/main.go b/main.go
index b19d73e..681141f 100644
--- a/main.go
+++ b/main.go
@@ -1,68 +1,68 @@
 package main
 
 import (
-    "os"
-    "flag"
-    "net/http"
+	"flag"
+	"net/http"
+	"os"
 
-    "github.com/rs/zerolog"
-    "github.com/rs/zerolog/log"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
 
-    "code.severnaya.net/kordophone-mock/v2/web"
-    "code.severnaya.net/kordophone-mock/v2/prompt"
+	"code.severnaya.net/kordophone-mock/v2/prompt"
+	"code.severnaya.net/kordophone-mock/v2/web"
 )
 
-type LoggingHook struct{
-    prompt *prompt.Prompt
+type LoggingHook struct {
+	prompt *prompt.Prompt
 }
 
 func (t *LoggingHook) Run(e *zerolog.Event, level zerolog.Level, message string) {
-    t.prompt.CleanAndRefreshForLogging()
+	t.prompt.CleanAndRefreshForLogging()
 }
 
 func setupLogging() {
-    debug := flag.Bool("debug", false, "enable debug logging")
-    flag.Parse()
+	debug := flag.Bool("debug", false, "enable debug logging")
+	flag.Parse()
 
-    // Pretty logging 
-    log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
+	// Pretty logging
+	log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
 
-    // Default level for this example is info, unless debug flag is present
-    zerolog.SetGlobalLevel(zerolog.InfoLevel)
-    if *debug {
-        zerolog.SetGlobalLevel(zerolog.DebugLevel)
-    }
+	// Default level for this example is info, unless debug flag is present
+	zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	if *debug {
+		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+	}
 }
 
 func main() {
-    setupLogging()
+	setupLogging()
 
-    c := web.MockHTTPServerConfiguration{
-        AuthEnabled: false,
-    }
+	c := web.MockHTTPServerConfiguration{
+		AuthEnabled: false,
+	}
 
-    addr := ":5738"
-    s := web.NewMockHTTPServer(c)
-    httpServer := &http.Server{
-        Addr:    addr,
-        Handler: s,
-    }
+	addr := ":5738"
+	s := web.NewMockHTTPServer(c)
+	httpServer := &http.Server{
+		Addr:    addr,
+		Handler: s,
+	}
 
-    // Populate with test data
-    s.Server.PopulateWithTestData()
-    log.Info().Msgf("Generated test data. %d conversations", len(s.Server.Conversations()))
+	// Populate with test data
+	s.Server.PopulateWithTestData()
+	log.Info().Msgf("Generated test data. %d conversations", len(s.Server.Conversations()))
 
-    log.Info().Msgf("Listening on %s", addr)
-    go httpServer.ListenAndServe()
+	log.Info().Msgf("Listening on %s", addr)
+	go httpServer.ListenAndServe()
 
-    rl := prompt.NewPrompt()
+	rl := prompt.NewPrompt(&s.Server)
 
-    // Hook logging so we can refresh the prompt when something is logged. 
-    log.Logger = log.Logger.Hook(&LoggingHook{prompt: rl})
+	// Hook logging so we can refresh the prompt when something is logged.
+	log.Logger = log.Logger.Hook(&LoggingHook{prompt: rl})
 
-    // Read indefinitely
-    err := rl.StartInteractive()
-    if err != nil {
-        log.Error().Err(err)
-    }
+	// Read indefinitely
+	err := rl.StartInteractive()
+	if err != nil {
+		log.Error().Err(err)
+	}
 }
diff --git a/model/conversation.go b/model/conversation.go
index 9f4d326..f99f301 100644
--- a/model/conversation.go
+++ b/model/conversation.go
@@ -1,6 +1,11 @@
 package model
 
-import "time"
+import (
+	"strings"
+	"time"
+
+	"github.com/rs/zerolog"
+)
 
 type Conversation struct {
 	Date               time.Time `json:"date"`
@@ -10,3 +15,22 @@ type Conversation struct {
 	LastMessagePreview string    `json:"lastMessagePreview"`
 	Guid               string    `json:"guid"`
 }
+
+func (c *Conversation) GetDisplayName() string {
+	if c.DisplayName == nil {
+		return strings.Join(c.Participants, ",")
+	}
+
+	return *c.DisplayName
+}
+
+func (c Conversation) MarshalZerologObject(e *zerolog.Event) {
+	e.Str("guid", c.Guid)
+	e.Time("date", c.Date)
+	e.Int("unreadCount", c.UnreadCount)
+	e.Str("lastMessagePreview", c.LastMessagePreview)
+	e.Strs("participants", c.Participants)
+	if c.DisplayName != nil {
+		e.Str("displayName", *c.DisplayName)
+	}
+}
diff --git a/prompt/prompt.go b/prompt/prompt.go
index d04f78c..1ec014f 100644
--- a/prompt/prompt.go
+++ b/prompt/prompt.go
@@ -1,63 +1,158 @@
 package prompt
 
 import (
-    "io"
+	"fmt"
+	"io"
+	"strings"
 
-    "github.com/rs/zerolog/log"
-    "github.com/chzyer/readline"
+	"code.severnaya.net/kordophone-mock/v2/server"
+	"github.com/chzyer/readline"
+	"github.com/rs/zerolog/log"
 )
 
 type Prompt struct {
-    rl *readline.Instance 
+	rl     *readline.Instance
+	server *server.Server
 }
 
-func NewPrompt() *Prompt {
-    rl, err := readline.NewEx(&readline.Config{
+func (p *Prompt) listConversations() {
+	conversations := p.server.SortedConversations()
+	for _, c := range conversations {
+		fmt.Printf("%s %s \t %s ", c.Guid, c.GetDisplayName(), c.Date.Format("2006-01-02 15:04:05"))
+		if c.UnreadCount > 0 {
+			fmt.Printf("(%d unread)", c.UnreadCount)
+		}
+
+		fmt.Println()
+	}
+}
+
+func (p *Prompt) listMessages(guid string) {
+	conversation, err := p.server.ConversationForGUID(guid)
+	if err != nil {
+		log.Err(err).Msgf("Error listing messages for conversation %s", guid)
+		return
+	}
+
+	messages := p.server.MessagesForConversation(conversation)
+	for _, m := range messages {
+		var sender string
+		if m.Sender == nil {
+			sender = "(Me)"
+		} else {
+			sender = *m.Sender
+		}
+
+		fmt.Printf("%s %s From: %s\n", m.Guid, m.Date.Format("2006-01-02 15:04:05"), sender)
+		fmt.Printf("\t %s\n", m.Text)
+	}
+}
+
+func (p *Prompt) markConversation(guid string, read bool) {
+	conversation, err := p.server.ConversationForGUID(guid)
+	if err != nil {
+		log.Err(err).Msgf("Error marking conversation %s as read", guid)
+		return
+	}
+
+	if read {
+		conversation.UnreadCount = 0
+	} else {
+		conversation.UnreadCount = 1
+	}
+}
+
+func NewPrompt(server *server.Server) *Prompt {
+	completer := readline.NewPrefixCompleter(
+		readline.PcItem("ls"),
+		readline.PcItem("mark",
+			readline.PcItem("-r"),
+		),
+		readline.PcItem("help"),
+		readline.PcItem("exit"),
+	)
+
+	rl, err := readline.NewEx(&readline.Config{
 		Prompt:          "\033[31m»\033[0m ",
 		HistoryFile:     "/tmp/readline.tmp",
 		InterruptPrompt: "^C",
 		EOFPrompt:       "exit",
+		AutoComplete:    completer,
 
-		HistorySearchFold:   true,
+		HistorySearchFold: true,
 	})
 
 	if err != nil {
 		panic(err)
 	}
 
-    return &Prompt{
-        rl: rl,
-    }
+	return &Prompt{
+		rl:     rl,
+		server: server,
+	}
 }
 
 func (p *Prompt) StartInteractive() error {
-    for {
+	for {
 		line, err := p.rl.Readline()
-        if err == readline.ErrInterrupt {
-            if len(line) == 0 {
-                break
-            } else {
-                continue
-            }
-        } else if err == io.EOF {
-            break
-        }
+		if err == readline.ErrInterrupt {
+			if len(line) == 0 {
+				break
+			} else {
+				continue
+			}
+		} else if err == io.EOF {
+			break
+		}
 
-        switch {
-        case line == "exit":
-            return nil
-        default:
-            log.Info().Msgf("Line: %s", line)
-        }
-    }
+		line = strings.TrimSpace(line)
 
-    return nil
+		switch {
+		case strings.HasPrefix(line, "ls"): // List
+			args := strings.Split(line, " ")
+
+			if len(args) == 1 {
+				p.listConversations()
+			} else {
+				p.listMessages(args[1])
+			}
+
+		case strings.HasPrefix(line, "mark"): // Mark
+			args := strings.Split(line, " ")
+			if len(args) < 2 {
+				log.Info().Msgf("Usage: mark [-r] <guid>")
+				continue
+			}
+
+			read := false
+			if args[1] == "-r" {
+				read = true
+				args = args[1:]
+			}
+
+			p.markConversation(args[1], read)
+
+		case line == "help": // Help
+			fmt.Println("Commands:")
+			fmt.Println("\tls                list conversations")
+			fmt.Println("\tls <guid>         list messages for conversation")
+			fmt.Println("\tmark [-r] <guid>  mark conversation as unread/[r]ead")
+			fmt.Println("\texit              exits the program")
+
+		case line == "exit": // Exit
+			return nil
+
+		default:
+			fmt.Printf("Unknown command: %s\n", line)
+		}
+	}
+
+	return nil
 }
 
 func (p *Prompt) CleanAndRefreshForLogging() {
-    p.rl.Clean()
-    
-    // xxx: Lazy hack to make sure this runs _after_ the log is written. 
-    go p.rl.Refresh()
-}
+	p.rl.Clean()
 
+	// xxx: Lazy hack to make sure this runs _after_ the log is written.
+	go p.rl.Refresh()
+}
diff --git a/server/server.go b/server/server.go
index 4722617..830edb8 100644
--- a/server/server.go
+++ b/server/server.go
@@ -54,11 +54,21 @@ func (s *Server) Conversations() []model.Conversation {
 	return s.conversations
 }
 
+func (s *Server) SortedConversations() []model.Conversation {
+	conversations := s.Conversations()
+	sort.Slice(conversations, func(i, j int) bool {
+		return conversations[i].Date.After(conversations[j].Date)
+	})
+
+	return conversations
+}
+
 func (s *Server) ConversationForGUID(guid string) (*model.Conversation, error) {
 	var conversation *model.Conversation = nil
-	for _, c := range s.conversations {
+	for i := range s.conversations {
+		c := &s.conversations[i]
 		if c.Guid == guid {
-			conversation = &c
+			conversation = c
 			break
 		}
 	}
@@ -119,7 +129,7 @@ func (s *Server) CheckBearerToken(token string) bool {
 	return s.authenticateToken(token)
 }
 
-func (s *Server) MessagesForConversation(conversation model.Conversation) []model.Message {
+func (s *Server) MessagesForConversation(conversation *model.Conversation) []model.Message {
 	messages := s.messageStore[conversation.Guid]
 	sort.Slice(messages, func(i int, j int) bool {
 		return messages[i].Date.Before(messages[j].Date)
diff --git a/web/server.go b/web/server.go
index 083f542..37f7768 100644
--- a/web/server.go
+++ b/web/server.go
@@ -104,7 +104,7 @@ func (m *MockHTTPServer) handleMessages(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	messages := m.Server.MessagesForConversation(*conversation)
+	messages := m.Server.MessagesForConversation(conversation)
 
 	jsonData, err := json.Marshal(messages)
 	if err != nil {