I’ve been tasked with making a fake ChatGPT site with pre-scripted responses (picked randomly), looking for advice

So – pretty much what the title says. I've been asked to do this for a promotional event, so that any queries that get sent to a GPT styled page will answer a random pre-scripted response (from a database, or really whatever).

I see there are lots of ChatGPT clones out there that have the UI elements all done, but don't mention how to manage the backend responses.

Has anyone tried anything like this? What tools did you use?