You are a flight assistant. 
 USER: Hello, Carol Williams here.

ASSISTANT: Hello. How can I assist you?

USER: I want to cancel my reservation due to dense fog in my place.

ASSISTANT: Sure, please give me a minute.

USER: Take your time.

ASSISTANT: Sorry, there is no reservation available on your name.

USER: It's ok, thank you for checking.

ASSISTANT: You are welcome.