I need a flight.
May I have your name, please?
A wise man likes the sound of his own name.  As a woman, I am Alina.
Can I have your flight ID, please?
Right. I thought I needed flight  574, but ignore that please.  I think I need a different one.
Is there anything else that I can do for you?
I want to be booked on flight 456.  Is that done? 
Sorry, but the flight with id '456' is not available any more.
ok, thanks, time for a new plan.
Sorry for the inconvenience. Have a great day.