You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Jones.

ASSISTANT: Jones, 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: I am happy to help you Jones, let me check your reservation status.

USER: Sure.

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

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

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