You are a flight assistant. 
 USER: Hello, I am Robert Robinson.

ASSISTANT: Hello, What can I do for you?

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

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found against your name.

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

ASSISTANT: Thank you for approaching us. Have a great day.