On what to write speech modules, communication scripts?

Question

Algorithms

The speech module is an algorithm for communicating with the client, if he says "this", then we go "there" and say "this and that", and so on, the usual branching! (visio immediately comes to mind, but that's not it)
We need a program to create a speech module so that we can conveniently switch between the phrases that the call center operator should say, depending on the customer's answers.

Answer 1

may suit AIML

Answer 2

Mind Map Manager

Answer 3

readscript.com