You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER:  I am William Miller want to cancel my reservation due to heavy snow storm.

ASSISTANT: Sure, I will check your details and revert to you.

USER: Ok.

ASSISTANT: Sorry to notify you that there is no reservation found under your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.