You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: May I know your name please??

USER: Myself Debra Phillips.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

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

ASSISTANT: Thank you for reaching us.