You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Can you aid me to book my ticket from DEN to LAX?

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

USER: My travel dates are Sept 25 and Sep 27 respectively.

ASSISTANT: May I know your name for further process?

USER: Edward Collins here.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: My arrival time should be in afternoon.

ASSISTANT: Do you have any another specifications?

USER: I prefer for direct flight.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

ASSISTANT: UA flight available and it is a direct flight, fare is 100, shall I confirm this economy class flight?

USER: Please proceed for booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1000.

USER: Thank you for the help.

ASSISTANT: You are welcome Edward Collins.