You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Hall here.

ASSISTANT: How may I help you?

USER: I need to cancel my recent reservation because of some health issues, can you please help me out with that?

ASSISTANT: Sure, I am happy to help you. Please allow me a moment.

USER: Thank you for accepting my request, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to help you out in cancellation process.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: You are most welcome and have a nice day.