You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Jones here.

ASSISTANT: How can I assist you?

USER: I want to cancel my ticket due to dense fog in my hometown.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to cancel.

USER: It's ok, thank you.

ASSISTANT: Most welcome.