You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Please change my existing reservation due to some issues?

ASSISTANT: Sure, may I know your name to check the reservation status?

USER: Sure, I am Rebecca Moore.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.