Mary: Sharon, I've been looking for you.
Sharon: Is there a problem?
Mary: No. I need someone to pick up a client from the airport on Saturday.
Sharon: I thought Greg was doing that.
Mary: He says he has to visit his parents this weekend.
Sharon: He didn't mention that to me.
Mary: Are you busy this Saturday?
Sharon: I'm sorry. I just got an urgent email. I need to reply immediately.
Mary: I see. I will talk to you later then.
Sharon: I'll be busy meeting clients all day.