You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I made a reservation earlier to visit one world trade center. Due to shortage of holidays trip has been postponed. Can you please change my existing reservation?

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

USER: Sarah Parker is my name.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: There was no reservations found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for choosing us.