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

ASSISTANT: Hello David, how may I help you today?

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

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Sorry Miller, there is no reservation found as per your name to cancel it.

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

ASSISTANT: You are welcome.