How to add chatbot into my website using assistant API

API
2

ran this code in python but seemed failed

from flask import Flask, request, jsonify
import openai

app = Flask(__name__)

 
openai.api_key = 'xxxxx'

@app.route('/chat', methods=['POST'])
def chat_response():
    user_input = request.json['message']
    response = openai.ChatCompletion.create(
        model="gpt-3.5-turbo",
        messages=[{"role": "user", "content": user_input}]
    )
    return jsonify({"reply": response['choices'][0]['message']['content']})

if __name__ == '__main__':
    app.run()