You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to heavy rainfall in JFK.

ASSISTANT: May I know your name?

USER: Shirley Harris, here.

ASSISTANT: Sorry, no reservation found with your name.

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

ASSISTANT: Thank you.

USER: You are welcome.