You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can aid you today?

USER: My friend birthday party place has been changed to New York. Can you please change my existing reservation?

ASSISTANT: Sure, we are glad to help you to change it. Help me with your name to find a reservation of your's.

USER: Sure, I am Katherine Collins.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for choosing us.