You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Last week I got a flight ticket booked, but due to ill health I will not be able to travel. So cancel my flight ticket? I am Carol Hill.

ASSISTANT: Ok, wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found.

USER: Ok, it is not a problem. Thanks for your information.

ASSISTANT: Thank you for picking us.