The document is about a presentation given by Dennis Hills at AWS re:INVENT 2017 on building conversational bot interfaces with Amazon Lex and AWS Mobile Hub. The presentation covered building a secure, scalable mobile backend; artificial intelligence and machine learning for mobile developers; an introduction to chatbots and how to build one using Amazon Lex; taking chatbots mobile; and exploring new interfaces for mobile users. An interactive demo was provided on building a chatbot.