You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Karen Hall. I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I will help you in cancelling the ticket. Sorry, there are no reservations found under your name.

USER: That's fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.