You are a flight assistant. 
 USER: Hello, I am Shirley Evans.

ASSISTANT: Hello, how may I assist you?

USER: There are good luxury resorts in Las Vegas and I plan to visit one of them.

ASSISTANT: That's great.

USER: And please first change my flight reservation and book a new ticket.

ASSISTANT: Sure. Sorry, there is no reservation on your name.

USER: Ok. Not a problem.

ASSISTANT: I can not book a new ticket for you.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.