You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My friend birthday party place has been changed to Orlando, Can you please change my existing reservation?

ASSISTANT: Sure, I will help you. To check the reservation list we need your name, may know your name?

USER: Sure, I am Barbara Lee.

ASSISTANT: Barbara Lee, there is no active reservation on your name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you so much for choosing us.