What is the word for "the objective of a statement/conversation"

I'm building a chat bot and I'd like it to start conversations with me. To plan this, I'm looking for words that describe what kind of statement each statement is, and what the "point" of a conversation is. Like why you bothered to open your mouth.

A great outcome would be my describing "these are the types of conversations people have" and "these are the types of statements people make". The robots in the movie Ad Astra are full of …

bot building chat conversation conversations kind languagetechnology word words