You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Stephanie Lewis. I have reserved flight ticket to New York to attend my friends party but it has been postponed, so help me to change my reservation.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found by your name.

USER: Ok, thanks for informing.

ASSISTANT: Thank you for picking us.