You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my existing reservation.

ASSISTANT: Sure, may I know your name please?

USER: My name is Susan Evans.

ASSISTANT: Thank you for providing your name, please wait for a minute I will check the status and revert you.

USER: OK.

ASSISTANT: Thank you for waiting, I am sorry to inform you that there was no flight found by your name.

USER: OK.Thanks for your information.

ASSISTANT: Have a good day.