You are a flight assistant. 
 USER: Hello. I am Kevin Wilson.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: There is no reservation with your name to change further.

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

ASSISTANT: Thank you for choosing us.