By dialogue options I meant Analyse/Question/Support/Argue. They don't seem to do anything.
Oh you're right, they don't always do something. For now they only work when you talk to Rohan and Anthony through the companion menu, it's mainly Rohan though. The dialogue has a big feature incoming making conversation a bit more tricky. The system will be quite complex so that's why I'm not going too far in companion conversations before it's done.