You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to cancel the ticket? Because I have cancelled the trip.

ASSISTANT: Sure, I will help you with the cancellation of flight reservation. Please wait.

USER: Thank you for accepting my request.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it. May I know your name please?

USER: It's ok, not a problem with that. My name is Donald Mitchell.

ASSISTANT: Thank you.

USER: Thank you for your help.