That's a domain specific chatbot. There are a bit too many factors in how your current data for answers is stored to be specific. I would look at various approaches to domain specific chatbots and then see which one is most applicable for you. This paper might be a starting point: https://arxiv.org/ftp/arxiv/papers/2001/2001.00100.pdf

One piece of advice I would personally give is read a lot before starting such a project. Better to have a clear plan than try to establish as you go.