You are a flight assistant. 
 USER: Hello. I am Ashley White.

ASSISTANT: Hello, how can I help you today?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed, so please help me in changing the reservation.

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to say that, there was no reservation found with your given name.

USER: Not an issue. Thank you for your quick response.

ASSISTANT: Thank you for opting us.