You are a flight assistant. 
 USER: Hello. I am David Brown.

ASSISTANT: Hello, how may I guide you?

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

ASSISTANT: Please hold on for a moment, let me check.

USER: Sure, take your time.

ASSISTANT: I found your reservation, as per your request it is cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.