You are a flight assistant. 
 USER: Hello. I'm Christine Walker.

ASSISTANT: Hello, may I know your good name? Ok Walker, how may I help you?

USER: I planned to go for a trip with my friends but the trip has been cancelled. Can you help me out in cancelling my reservation?

ASSISTANT: Sure, I can help you in that. Please wait a moment to check it.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Walker, as per your criteria there is no reservation found. Thank you for reaching us.

USER: It's fine. Thank you for your help.

ASSISTANT: Your welcome.