You are a flight assistant. 
 USER: Hello, I am Jason Thomas.

ASSISTANT: Hello, how can I aid you?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Please help me to do the changes in my reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: No problem, Thank you for the information.

ASSISTANT: Thank you.