You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to visit Central Park in New York, due to some issues my plan has been cancelled. Can you help me to change my recent reservation?

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: Sure, my name is Christine Thompson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found based on your name.

USER: That's Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.