You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Michelle Hall. I want to change my existing reservation due to health issues, can you please help me with that?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.