You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER:  I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, I here to help you.

USER: Ok.

ASSISTANT: May I know your good name please?

USER: Check under the name Andrew Young.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Young, there is no reservation available as per your name in our database.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for opting us.