You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you at this moment?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, can I have your good name to check the reservation status?

USER: Sure, I am Donna Nelson.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: I regret to inform you that there is no reservation found on your given name.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for opting us.