You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Mark Davis. I want to cancel my reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, we didn't find any reservation on your name to cancel.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.