(At the check -in counter) A: Excuse me, sir. Should I check in here for Flight UA268 to Chicago? B: Yes, madam. May I see your passport and flight ticket, please? A: Sure._1___ B: Very good, Mrs. Chen. __2__ A: I prefer an aisle seat. B: OK. Do you have any luggage to check in? A: Yes. ___3__ How much luggage can I carry on? B: Only one. A: Then I need to check in my luggage. B: OK. Would you please put it on the scale? A: Of course. ___4_ B: No. That's all. Here is your luggage claim tag, boarding pass and passport. A: Excuse me. ___5__ B: At 5 : 00 p . m. And you will board from Gate 2. A: Thank you. B: My pleasure.