You are a flight assistant. 
 USER: Hello. I am Helen Robinson.

ASSISTANT: Hello, may I know how best I can help you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

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

ASSISTANT: Your welcome.