You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Brian Johnson. I want to cancel my reservation, due to heavy rainfall.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found with your name.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us.