“…The conversational agents will retrieve the required information or knowledge from the KB to understand customers' queries and construct answers to the questions. From the literature, a number of chatbots are supported by KB containing FAQs and data crawled from external sources, such as webpages (Herrera et al 2019). There are also some chatbots that answer queries incorporating chat history (Griol and Molina 2016;Wang et al 2019) or user profiles and behaviors (Cha et al 2019).…”