You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Nicholas Edwards.

ASSISTANT: How may I help you?

USER: Due to health problem, I want to cancel my reservation.

ASSISTANT: Sure, wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation has been found on your name.

USER: Ok, thank you for helping me.

ASSISTANT: Thank you for choosing us.Have a nice day.