Update app.py

app.py

@@ -34,7 +34,7 @@ def chat_with_chatgpt(user_id, user_message):
 
     # 调用ChatGPT API
     response = openai.Completion.create(
-        engine="text-davinci-002",
+        engine="gpt-3.5-turbo",
         prompt=[{"role": "system", "content": "You are a helpful assistant."}] + user_dialogue_histories[user_id],
         max_tokens=150,
         n=1,