You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have planned an event with my friends but suddenly it got cancelled. So please help me with cancelling my reservation.

ASSISTANT: Sure, I will help you out in cancelling reservation. May I know your name please?

USER: Sure, myself David Lewis.

ASSISTANT: Please wait a moment.

USER: Sure, take your time to check.

ASSISTANT: Sorry, there are no reservations found.

USER: Oh! It may not be booked properly while booking.

ASSISTANT: Thank you for choosing us.

USER: Anyway, thank you for your time.