You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at present?

USER: I want to cancel my reservation due to some health issues, so please help me in cancellation.

ASSISTANT: Sure, we are here to help you with cancellation.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: Sure, my name is Frank Johnson.

ASSISTANT: Sorry to tell you that, there was no reservation found on your name to cancel it.

USER: Not a problem, thank you.

ASSISTANT: Thank you for availing our service.