I think if we were to be able to message within a team, we should have both options of replying specifically to someone's response or reply and his enter. It seems kind of not efficient to have to click on "reply" every time.
some kind of two level response (like in Facebook)
Dong Hyun Cho commented
Yeah, I agree. As an user, I chat a lot with my team. Sometimes I respond late and wanted to answer the comment made earlier just like Facebook comment.