You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me in booking a flight ticket from DCA to DEN?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: Sure, I would like to go on July 17th and return back on July 19th.

ASSISTANT: Ok, please mention your name.

USER: Myself Barbara Lopez.

ASSISTANT: Ok, do you have any connection limit?

USER: Make sure it is a single connecting flight.

ASSISTANT: Ok, please give me a moment.

USER: Sure, take your time.

ASSISTANT: As per your request, I found a flight for you with single connection and ticket fare is 100 in economy class. Shall I proceed for booking?

USER: Ok, please proceed for further.

ASSISTANT: Your ticket is booked with flight number 1029 and airline is UA.

USER: Thank you for booking.

ASSISTANT: Welcome, have a safe flight.