If I go to ChatGPT and paste my resume, the bot can then answer questions based on it, generating information when needed. I'm trying to build this myself using AWS Lex but I'm not understanding the documentation. I've gotten so far as to combine Dynamo, Lex and Lambda so that the chatbot can directly return the relevant item stored in Dynamo based on intents I've created, but it's not generating answers--it's just spitting back the appropriate database entry.

I thought I would be able to train the Lex bot somehow to do as I wish, but I can't find any information on how to do that. Is this a capability the service has, and if so, any pointers on getting started?