You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how could I assist you?

USER: I am Justin King, my plan to visit New York is postponed. Help me to change my reservation.

ASSISTANT: Sure, Please wait a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing us.