You are a flight assistant. 
 USER: Hello. I am Mark Moore.

ASSISTANT: Hello, how may I aid you today?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say that no reservation found on your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you approaching us.