Chatbot for Shopping app

I am creating an online shopping app with entities Customer,Product,Rating and Review,Favourites,Feedback,Total bill,Order,Delivery Address and assoiations between them. Now,I have to add chatbot or query resolver functionality to rectify queries and answer my questions,so that I can get a clarified view of the product as a buyer role.(I have created 3 user roles: Admin,buyer,Anonymous). Below I have shared Domain model for reference:
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