You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Angela White here.

ASSISTANT: How can I help you at this moment?

USER: I would like to attend a meeting at Denver, please help me in booking a ticket from LAS to DEN.

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

USER: I am willing to travel on Apr 11 and return on Apr 13.

ASSISTANT: Is there any additional preferences do you have?

USER: I need an economy class ticket.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I need a connecting flight.

ASSISTANT: There is a Southwest airline flight available with connection limit 1 and fare is 200, shall I confirm this economy class flight?

USER: Ok, please proceed for booking.

ASSISTANT: I have confirmed your flight ticket, flight number is 1013.

USER: Thank you for your assistance.

ASSISTANT: You are welcome Angela White.