A: can I have your ticket, please?
B: certainly, here you are.
A: how much luggage do you have?
B: two suitcases. This small bag is my hand luggage. 
A: that's fine. 
B: can I have a seat next to the window?
A:I'll check. Yes,that's OK . here's you boarding pass. Have a nice day. 
B:thank you. And where is passport control?
A:over there. Follow the signs. 
B:can I see you passport, please?
A:of, course. Here you are. 
B:thank you very much. That's fine.