Tim: Hello.
Passenger: Hello. Is everything all right?
Tim: Oh, yes – but I think you're in my seat.
Passenger: Is the seating reserved here?
Tim: Yes, it is. Which seat do you have?
Passenger: Just a moment ... 42b.
Tim: I have 42a. 42b is an aisle seat. 42a is the window seat.
Passenger: Oh, excuse me.
Tim: It's no problem. Stay where you are. I prefer an aisle seat anyway.
Passenger: Thank you.