I don't think it is necessary, I would never be able to sit through listening to what I've already thought about and chosen to say and THEN have to listen to the NPC's response, unless it was done in the same way Mass Effect did it e.g. only showing the responses as Postive, Negative and Neutral.
I actually prefer thinking up my own voice and choosing my specific response, makes it feel like I'm the one doing it, rather than just telling someone what to do if that makes sense?