You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Paul Green here.

ASSISTANT: How may I help you?

USER: I want to cancel my reservation which I have done previously but due to my health issue I want to cancel my reservation.

ASSISTANT: Sure, I will help you in cancelling reservation. Please hold on for a while.

USER: Thank you for noting my request. Ok, sure.

ASSISTANT: Sorry, there are no reservations found.

USER: It's ok, thank you for the help.

ASSISTANT: Thank you for choosing us.