Amazon Polly
Amazon Rekognition
Amazon Lex
Amazon Polly
Amazon Rekognition
Amazon Lex
This video from IBM seems to demystify the process of creating a bot by showing how some of Watson’s features (natural language processing, dialogue) link together to understand and respond to questions.
https://youtu.be/QWEFDjw3B34
https://www.ibm.com/watson/