So I saw this Text game on this site where on a character you pick the verb speak too,
you get the meassage
Talk to the character about:
Hi, Check out the Quest Documentation page: link below;
It tells you how to do lots of cool stuff.
But, I think the ones you need are the two listed below. The first is the conversation library, the second is a more general way to implement speech/ talking to NPC's (Non-Player Characters) in your game.
Hope this helps.