try

app.py

@@ -9,7 +9,7 @@ def respond(message, history):
     if history:
         messages.extend(history)
         
-    messages.append({"role" : "user", "content" : messages})
+    messages.append({"role" : "user", "content" : message})
     response = client.chat_completion(messages, max_tokens = 100)
 
     print(response ["choices"][0]["message"]["content"].strip())