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Clerk: Good Morning.
Mr S : Is this the right desk? My flight is BA123.
Clerk: Yes, that's right. I need your passport and your ticket, please.
Mr S: There you go.
Clerk: Thank you. Do you have any luggage to check in Mr Smith?
Mr S: Yes, these two suitcases.
Clerk: Could you put them on the conveyor belt, please.
Mr S: Sure. I don't think they are over.
Clerk: No. That's fine. Would you like a window or an aisle seat?
Mr S: A window seat, please.
Clerk: ... Here are your luggage tags and your boarding card. Your seat is 36B.
Mr S: Thank you. What is the boarding time?
Clerk: The plane is boarding in 30 minutes. You leave from Gate 15. Have a good flight.
Mr S: Thank you. Goodbye.