A Dynamic City Simulator

My goal is to create a city where you can work, drive around, and interact with things—basically a life simulator like RoCitizens or Bloxburg. There will be NPCs you can talk to and have real conversations with. Currently, the NPCs can't have real conversations as they can only reply with hundreds of responses I gave them. But soon, they will be able to generate their own responses, just like ChatGPT. It will feel like you are in a city with actual people with whom you can have conversations! Currently, the NPC(s) in this game can only talk about space. (Yes, there isn't a city yet.)