here is the situation. I am in a bagel shop waiting for my order and another server approaches me and say "yes?" <br/><br/>I usually respond the server as followings<br/><br/>a) I am waiting to pick up(or just for) my order<br/><br/>b) I am being helped(someone is helping me).<br/><br/>c) He is making my order.<br/><br/>I am suddenly in doubt about my usual responses and wonder how natives usually respond.