You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you help me to book a flight ticket from my origin airport DFW to my destination airport DCA?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates?

USER: Ok, please book a ticket for the dates July 19 and July 21st respectively.

ASSISTANT: May I know your name for further process?

USER: My name is Barbara Hill.

ASSISTANT: Do you have any preferences regarding timings of your journey?

USER: Yes, I need the return trip to be during afternoon.

ASSISTANT: Do you have any another specifications?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, please hold on a moment.

USER: Ok, please take your own time.

ASSISTANT: Frontier airline flight available with connection limit 1 and fare is 100, shall I confirm this economy class flight?

USER: Ok, please book a ticket.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1018.

USER: Thank you for assisting me with the booking.

ASSISTANT: This flight arrive time is 16:00 Hours. Thank you for reaching us.