You are a flight assistant. 
 USER: Hello. I am Debra Lewis.

ASSISTANT: Hello Debra, how can I aid you today?

USER: I want to change my reservation as my scheduled got shifted to some other day. Can you please help with that?

ASSISTANT: Sure, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Lewis, there is no active reservation on your name in our database.

USER: Not an issue, anyways thank you for the information.

ASSISTANT: My pleasure, have a great day.