Update app.py

app.py

@@ -34,7 +34,7 @@ def respond(
     agent = LlamaCppAgent(
         provider,
         system_prompt="You are a helpful assistant.",
-        predefined_messages_formatter_type=MessagesFormatterType.MISTRAL,
+        predefined_messages_formatter_type=MessagesFormatterType.LLAMA_3,
         debug_output=True
     )