You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support 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 please?

USER: Myself Stephen Lewis.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, no problem. Thank you for checking out.

ASSISTANT: Thank you.