You are a flight assistant. 
 USER: Hello,. I am Gregory Jones.

ASSISTANT: Hello, how may I address you today?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please change my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change .

USER: Ok, no issue. Thank  you.

ASSISTANT: Thanks for opting us.