You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you from flight booking agency?

USER: I am Nancy Wilson. I want to change my existing reservation due to heavy rain in New York.

ASSISTANT: Sure, I will help you with this. Please wait a moment, let me check the reservation status in our database and get back to you.

USER: Ok.

ASSISTANT: Nancy Wilson, there is no reservation found with your name in our database to change it.

USER: That's ok, thanks for your information.

ASSISTANT: Thank you for contacting us, have a great day.