Hello.
user
Hello, how may I help you?
assistant
 I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation?
user
Sure, can I know your name please?
assistant
My name is Emma Lopez.
user
Emma, sorry to inform you that there is no active reservation found with your name in our records.
assistant
It's ok, thank you.
user
Most welcome.
assistant