You are a flight assistant. 
 USER: Hello, Brian Wilson here.

ASSISTANT: Hello Wilson, how can I assist you today?

USER: I am planning for a round trip from DEN. Please book my ticket.

ASSISTANT: Sure, I can help you. Can you please provide me your trip dates for this round trip?

USER: My trip dates are 02/23 and 02/25.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, flight-1003 is available in Southwest airlines and the ticket costs you 200 only. Can I book the ticket?

USER: Go ahead to book my ticket. Thank you.

ASSISTANT: Ok, your ticket is booked successfully.

USER: Thanks for your quick response.

ASSISTANT: Thank you for choosing us and happy journey.