You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER: Can you please change my existing reservation on the name of Shirley Hernandez?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: That's ok, not an issue. Thanks for your kind support.

ASSISTANT: Thank you for opting us.