You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: As my visiting to New York got postponed, As there is heavy protest is going on there. Can you help me for that? I am Sharon Rodriguez, I want to change my existing reservation.

ASSISTANT: May I know your name please? Please wait for a while, I will check and get back to you.

USER: OK.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok thanks for your kind service.

ASSISTANT: Thanks for choosing us.