You are a flight assistant. 
 USER: Hello. My name is Raymond White.

ASSISTANT: Hello, how may I serve you?

USER: I want to attend for a Columbus day in Dallas & Fort Worth, so please book a flight ticket from NV-LAS to TX-DFW.

ASSISTANT: Sure, may I know your travelling dates?

USER: My departure day is 10/09, return day is 10/11. And my price limit is 200.

ASSISTANT: There is a flight with airline:AA and flight number:1020 and price 200. Shall I proceed?

USER: Yes, please.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for your good service.

ASSISTANT: Thank you have a safe journey.