You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Allen.

ASSISTANT: How can I assist you today?

USER: I want to change my existing reservation, due to heavy rainfall in New York.

ASSISTANT: I will help you with that. Give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's fine, thank you for your information.

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