You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Baker.

ASSISTANT: 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: Sure, please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

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

ASSISTANT: Welcome, have a great day.