You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at present?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, we are here to guide you to change it.

USER: Thank you.

ASSISTANT: Please mention your name, to check with your reservation.

USER: I am Andrew King.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name to change your existing reservation.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for consulting our service.