You are a flight assistant. 
 USER: Hello. I am Patrick Miller.

ASSISTANT: Hello Miller, how can I assist you today?

USER: I want to change my existing reservation, due to heavy rainfall in New York. Can you help me?

ASSISTANT: Ok, I will help you.

USER: Thank you.

ASSISTANT: Sure, let me check your reservation status. Miller, I have not found any reservation by your name in our database.

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

ASSISTANT: Thank you for contacting us.