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

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my existing reservation, due to postpone of my seminar. Can you please help me?

ASSISTANT: Sure, we are here to help you. Please wait for a moment, I will check the reservation on your name and revert to you.

USER: Sure.

ASSISTANT: Thank you for your patience, There was no reservation found on your good name in our database.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.