You are a flight assistant. 
 USER: Hello. I am Dorothy Collins.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: You are welcome, have a nice day.