Perhaps a little off-topic, but would it be possible to make a chatbot whose answers or "personality" are based on somebody's emails and chat history, similar t

Perhaps a little off-topic, but would it be possible to make a chatbot whose answers or "personality" are based on somebody's emails and chat history, similar to the concept of the Black Mirror episode, Be Right Back? https://en.wikipedia.org/wiki/Be_Right_Back_(Black_Mirror) https://en.wikipedia.org/wiki/Be_Right_Back_(Black_Mirror)