You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Sure, may I know your name?

USER: Thank you. Myself Nicholas Phillips.

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

USER: That's no, problem. Thank you for checking out.

ASSISTANT: Thank you.