I am trying to develop a chatbot that needs to have a basic ontology embedded in it. I'm having trouble thinking of an approach to solve these kinds of problem.
For example,
User Input: Who is Barack Obama?
Answer: Barack Obama is a politician of the USA.
User Input: What is his age?
Answer: 57 years.
What should I do to let the system know his in the second question refers to Barack Obama in the first question? Thanks.