Simple AI Voice Assistant using OpenAI API

assistant.py

import speech_recognition as sr
import pyttsx3
import openai

openai.api_key = "Your API Key"

engine = pyttsx3.init()
voices = engine.getProperty('voices')
engine.setProperty('voices', voices[1].id)

r = sr.Recognizer()
mic = sr.Microphone(device_index=1)

conversation = ""
user_name = "Dan"
bot_name = "John"

while True:
    with mic as source:
        print("\n Listening...")
        r.adjust_for_ambient_noise(source, duration=0.2)
        audio = r.listen(source)
    print("no longer listening")

    try:
        user_input = r.recognize_google(audio)
    except:
        continue

    prompt = user_name+":"+user_input + "\n"+bot_name+":"
    conversation += prompt

    response = openai.Completion.create(
        model="text-davinci-003",
        prompt=conversation,
        temperature=0.7,
        max_tokens=256,
        top_p=1,
        frequency_penalty=0,
        presence_penalty=0
    )

    response_str = response["choices"][0]["text"].replace("\n", "")
    response_str =response_str.split(
        user_name + ":" ,1)[0].split(bot_name+ ":",1)[0]

    conversation+= response_str +"\n"
    print(response_str)

    engine.say(response_str)
    engine.runAndWait()
    

Hello, how do I change the accent?

kages\httpx_transports\default.py", line 97, in
httpcore.UnsupportedProtocol: UnsupportedProtocol,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'httpcore' has no attribute 'UnsupportedProtocol'

How could this code be changed to use GPT 3.5 turbo?
Change this part.
response = openai.Completion.create(
model="text-davinci-003",
prompt=conversation,
temperature=0.7,
max_tokens=256,
top_p=1,
frequency_penalty=0,
presence_penalty=0
)

give chatgpt the error or question it would solve it