You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I help you?

USER: I want to book a flight ticket to Dallas and Fort Worth, TX-DFW on 02/26 to celebrate my parents wedding anniversary.

ASSISTANT: OK, could you please provide source city and date?

USER: My origin airport is Las Vegas, NV-LAS and will back on 02/28, I need a ticket with in 200.

ASSISTANT: OK, may I know your name for booking the ticket?

USER: By the way I am Nicole Parker.

ASSISTANT: OK Nicole, there is flight 1020 in Southwest airline with price 200. Shall I with the booking?

USER: Yes, Please.

ASSISTANT: OK, your booking is done. Have a safe journey!.

USER: Thank you so much for your service.