While looking around for an outlining tool I found this interesting article where the author describes how they wrassled a general purpose flowchart tool into a conversation editor,
koobazaur.com/gamedev/game-desig … ersations/
edit: it’s kind of funny, here’s a more recent article from the same site, koobazaur.com/gamedev/game-desig … ear-games/ , also a good one.