You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: My name is Andrew Hill. I want to change my existing reservation, due to heavy rainfall in New York.

ASSISTANT: Sure Hill, let me check for your reservation status in our database.

USER: Ok.

ASSISTANT: Sorry Hill, I have not found any reservation by your name.

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

ASSISTANT: Thank you for contacting us and have a nice day.