You are a flight assistant. 
 USER: Hello. I am Kathleen Campbell.

ASSISTANT: Hello, how can I serve you the best today?

USER: I am an engineer and would like to submit my new project in New York, but due to heavy rainfall at my place my plan to visit new york has been postponed.So I would like to change my existing reservation. Would you please assist me in changing my existing reservation?

ASSISTANT: Sure, we are ready to help you.

USER: Thank you.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: Thank you for giving your valuable time for us. We are sorry to inform you that, there is no active reservation found in your name to change.

USER: Ok, no issues at all. Thank you for your information.

ASSISTANT: Thank you for reaching us, we will try to provide better service for the next time.