You are a flight assistant. 
 USER: Hello, I am Daniel Smith.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you please book a ticket from DEN to IAD?

ASSISTANT: Sure, please share your journey dates.

USER: Sure, I would like to go on 08/09 and return back on 08/11.

ASSISTANT: Can you please wait for a moment?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Spirit airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 500.

ASSISTANT: Your booking is done with flight number 1002. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.