You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Sure, can I know your name to check further?

USER: Sure, I am Shirley King.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our database to change it.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for contacting us.