You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Karen Walker.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for choosing us.