Reserve me a flight with ID 572.   Quickly
May I have your name, please?
You don't know my name?  Come on.  It's John.  Try and remember assistant
The flight is available. Should I reserve it for you?
Ahh not that flight.   The ID is 466.   Jeez
Sorry, but the flight with id '466' is not available any more.
What?  That's terrible.  Check again.   And make it snappy
The flight is available. Should I reserve it for you?
Duh.   Yes I want it reserved.   Why else would I be asking
Right, your flight is now reserved!
Get lost
Is there anything else that I can do for you?