You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER:  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?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous reservation?

USER: Amy Davis.

ASSISTANT: Please be on hold to check.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.