Hello.
user
Hello. How can I aid you?
assistant
 I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you help me to change it?
user
Sure, We are here to help you. May I know your name?
assistant
Sure, my name is Richard White.
user
Give me a minute.
assistant
Sure.
user
Thanks for your time. We didn't found any reservation by this name.
assistant
Ok, thanks for your information.
user
Thank you.
assistant