Yea I need a flight asap.
Can I have your flight ID, please?
OMG, you don't already have that. Sure it's 539 I guess.
May I have your name, please?
Should I just do this myself, geesh. Yea it's Angela.
Sorry, but the flight with id '539' is not available any more.
Well that is because the id is actually 888, I thought you knew that.
The flight is available. Should I reserve it for you?
Sure
Right, your flight is now reserved!