In case you don't know, this all started with ELIZA, so: https://en.wikipedia.org/wiki/ELIZA https://en.wikipedia.org/wiki/ELIZA You might follow that into ba

In case you don't know, this all started with ELIZA, so: https://en.wikipedia.org/wiki/ELIZA https://en.wikipedia.org/wiki/ELIZA You might follow that into background of other "chatterbots" - https://en.wikipedia.org/wiki/Outline_of_natural_language_processing#Chatterbots https://en.wikipedia.org/wiki/Outline_of_natural_language_pr... These would traditionally be in some variant of Lisp, for its metaprogramming capabilities. But see also: https://en.wikipedia.org/wiki/AIML https://en.wikipedia.org/wiki/AIML User interface? Well, see Alexa, Siri, etc.