You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How  can I help you?

USER: Due to some health problems, I would like to cancel my recent reservation. Please help me out.

ASSISTANT: Sure, may I know your name please.

USER: Sure, my name is Michelle Roberts.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.