You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you for the day?

USER: Please change my reservation.

ASSISTANT: Sure, may I know your name?

USER: Gregory Moore.

ASSISTANT: Please wait, I will check the reservation on your name and get back to you.

USER: Ok, I will wait.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.