How to integrate LangGraph with existing AI chatbot for interview automation

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I have built a Python app that uses AI to interview candidates and analyze their behavior. Right now it works but I want to make the conversation flow better using LangGraph. Here is what my current code looks like:

import os
import json
import openai
from personality_data import PERSONALITY_TYPES

# Save chat history to JSON file
def store_chat_history(chat_data):
    file_id = os.urandom(4).hex() + '.json'
    with open(file_id, 'w') as output_file:
        json.dump(chat_data, output_file, indent=2)
    return file_id

# Get candidate information at start
def get_candidate_info():
    client = openai.OpenAI()
    greeting_request = "Create a professional greeting to collect the candidate's full name for an interview session."
    ai_response = client.chat.completions.create(
        model="gpt-3.5-turbo",
        messages=[{"role": "user", "content": greeting_request}]
    )
    greeting_text = ai_response.choices[0].message.content
    full_name = input(f"\nInterviewer: {greeting_text}\nYour answer: ")
    print(f"\nInterviewer: Great to meet you {full_name}. We can now begin the assessment.\n")
    return full_name

# Collect responses from user
def collect_response(question_text):
    user_input = ""
    while not user_input:
        user_input = input(f"\nInterviewer: {question_text}\n\nYour response: ").strip()
        if not user_input:
            print("Interviewer: I need you to provide an answer please.")
    return user_input

# Start the interview process
candidate_name = get_candidate_info()

My app works for basic questions but I want to add LangGraph so it can make smarter decisions about what questions to ask next based on the candidate’s previous answers. I tried using CrewAI before but it was too complicated for what I need.

What I have done so far:

  1. Built basic interview functions with CrewAI for talking to candidates
  2. Started looking into LangGraph but not sure how to connect it properly
  3. Made functions that can introduce candidates and save their responses using OpenAI

What I need help with:

  • Step by step guide to add LangGraph to my current code
  • Better ways to organize AI agents for interview tasks
  • Should I use something else instead of LangGraph that might be easier

I am pretty new to these AI frameworks so any simple examples or tips would be really helpful. Thanks for any advice you can give me.