Hi
Hello, how can I help?
My name is John and I need to reserve  a flight.
Can I have your flight ID, please?
Flight ID is 520.
Sorry, but the flight with id '520' is not available any more.
Huh, does it say why?
I am sorry, I don't quite understand what you mean. I am only able to help you reserve a flight.
Any advice on what step I should take next?
I am sorry, I don't quite understand what you mean. I am only able to help you reserve a flight.
Ok, thanks. I guess I'll search online for a different flight.
Thank you and goodbye.