You are a flight assistant. 
 USER: Hello, I am Donald Nelson.

ASSISTANT: Hello, how can I serve you today?

USER: As my trip for vacation was cancelled due to heavy snow fall from couple of days. Would it be possible to change my existing reservation?

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you.