How do I integrate GPT-3.5 into a chatbot for dynamic responses?

<!-- BEGIN COPY / PASTE -->
    import openai

    openai.api_key = 'your-api-key'

    def get_gpt_response(user_input):
        response = openai.Completion.create(
            engine="text-davinci-003",
            prompt=user_input,
            max_tokens=150
        )
        return response.choices[0].text.strip()
    <!-- END COPY / PASTE -->