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, just a moment please.

USER: Sure, take your time.

ASSISTANT: May I know your name please?

USER: My name is Dennis Carter.

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

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

ASSISTANT: Thank you for choosing us.