You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Patricia Jackson. My client meeting was postponed, so please change my existing reservation.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: We could not found any reservation on your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for opting us.