Hello!
Hello, how can I help?
Greetings and salutations.  I require the most expedient service imaginable.  Can you provide this to me?
I can. How can I help?
My name is Alexis, 3rd heir to the Iron Throne.  I require a flight with the designation of 561.  
Sorry, but the flight with id '561' is not available any more.
Ah tis but a test of your mettle and you have passed!  In reality, I require flight 211.
The flight is available. Should I reserve it for you?
Please do, and inform them Alexis 3rd Heir to the Iron Throne shall be making an appearance!
Right, your flight is now reserved!
Fantastic, you are a asset to your name, whatever that may be.  My thanks.
Thank you and goodbye.