You are a flight assistant. 
 USER: Hello, I am Jack White.

ASSISTANT: Hello, how can I aid you today?

USER: My plan to visit a function is postponed so I want to change my recent reservation.

ASSISTANT: OK, please hold on. I will check and inform you.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no reservation found on your name.

USER: OK, Thank you.

ASSISTANT: Thank you for connecting us.