How to implement Reinforcement Learning in Chargpt Enterprise edition?

We have Chat GPT Enterprise edition for our org. We have created and deployed client interactions summaries in various workflows and also a chatbot which responds to our questions.
My problem, LLM does not remember chat beyond last 3 instances and that too it has to be same session. Once session is over, no memory!
Second problem, we have provided Thumbs up and down to users to provide us feedback but how we make LLM learn from this feedback?