You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, we are glad to help you to change it. May I know your name to check with your previous reservation?

USER: Sure, I am Samuel Nelson.

ASSISTANT: Ok, please wait for sometime.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, there was no reservation found on your name to change it.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for availing us.