You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please help me out to cancel my reservation?

ASSISTANT: Ok, may I know your name please?

USER: Sure, my name is Michelle Gonzalez.

ASSISTANT: Sorry, there is no flight reservation by your name.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.