You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to cancel my reservation due to heavy floods at my destination place, so please help me.

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is William Walker.

ASSISTANT: Sorry, no reservation found on your name to cancel it.

USER: No issues, thank you.

ASSISTANT: Welcome, have a good day.