You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald Campbell.

ASSISTANT: How may I aid you today?

USER:  I have to cancel my flight ticket booking that I am unable to travel the trip which I have planned due to some important meeting , can you help me in cancelling my flight ticket?

ASSISTANT: Sure. Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: Ok, no issues. My brother might have cancelled my reservation. Thank you.

ASSISTANT: Thank you for choosing us.