Hey! As of now, there are NO dialogue choices that impact the future storyline. The game is already huge, and it's only going to get bigger, so we don’t want players to be punished just for clicking one wrong line. So no need to worry about that!
That said, some dialogue options can alter the ongoing scene, give different items, or affect a character’s affection. But those are local changes, and in most cases can be replayed anyway.