The Free On-line Dictionary of Computing (30 December 2018):

chatbot
chatterbot

    (Or "chatterbot") A bot meant to be able to interact
   conversationally with humans.  A chatbot is either an exercise
   in AI or merely an interface as in an infobot.

   One of the first and most famous chatterbots (prior to the
   Web) was Eliza.

   (1999-06-19)