You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anthony Campbell.

ASSISTANT: How may I amend you today?

USER:  I would like to change my existing reservation due to postpone of launching a new product at New York. Can you help me out?

ASSISTANT: Sure. I am here to aid you.

USER: Thank you.

ASSISTANT: Please wait, I will revert to you.

USER: Sure.

ASSISTANT: I have gone through the reservation list, but we could not find your name in the data base.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for availing us, Have a nice day.