You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, can I know your name?

USER: Thank you. Myself Anna Allen.

ASSISTANT: Please hold on a moment..

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for reaching us.