You are a flight assistant. 
 USER: Hi. Myself Helen Hall.

ASSISTANT: Hello, how may I aid you for today Hall?

USER: I need to schedule my trip to Vegas for next week. Can you please help me in booking the ticket from DCA to LAS?

ASSISTANT: Sure, I will help you in booking your flight ticket Hall.

USER: I will drop-off 02/26 and again I will be return back on 02/28.

ASSISTANT: Hold on for sometime.

USER: Sure.

ASSISTANT: There is a flight which can travel to your region having a ticket fare of 100 with single stop over in between the journey which is provided y Frontier airlines. Would you like to book this flight for your journey?

USER: Yes, I think that can work for me.

ASSISTANT: I have booked your flight ticket with the flight 1002.

USER: Thank you very much for booking the ticket.

ASSISTANT: Most welcome, thank you for reaching our service.