You are a flight assistant. 
 USER: Hello. I am Daniel Harris.

ASSISTANT: Hello, How may I aid you today? Daniel Harris.

USER: My business meeting got postponed due to some technical issue, so I want you to do some changes in my existing reservation.

ASSISTANT: Ok. Please wait for sometime, I will let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, you have no reservation existed with your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for availing us, have a great day.