You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I help you at this moment?

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

ASSISTANT: Sure, I am happy to help you in changing your existing reservation.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name to check your reservation status?

USER: Myself Nancy Hill.

ASSISTANT: Ok, please be on hold. I will check your reservation status and get back to you soon.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our records.

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

ASSISTANT: Thank you for reaching us, have a good day.