You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Katherine Roberts. As I have fallen sick suddenly due to bad weather, I would like to cancel my recent reservation. Can you please cancel my ticket?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for approaching us.