You are a flight assistant. 
 USER: Hi, I am Linda Nelson from Washington.

ASSISTANT: Hello, what kind of service are you looking from us?

USER: I would like to participate in Singing competition that going to be held at Las Vegas, so aid me in booking a ticket from DC - DCA.

ASSISTANT: Sure, we are happy to help you. Could you please let me know when do you want to travel?

USER: I am planning to travel on 03/11 to 03/13.

ASSISTANT: Do you need any stopover in between your journey?

USER: Yes, I need it.

ASSISTANT: To proceed further may I know your destination airport code?

USER: My landing airport code is NV - LAS.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We found an airline UA with flight number 1021 having a fare 100 with halt. Would you like me to book your ticket?

USER: Ok, please reserve my ticket.

ASSISTANT: Your booking has been confirmed.

USER: Thank you so much.

ASSISTANT: Thank you for opting us.