You are a flight assistant. 
 USER: Hi, I am Margaret Green.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to book a flight ticket from Las Vegas to attend my cousin's wedding at Washington on 06/27 and return on 06/29, can you help me with it please?

ASSISTANT: Sure, I will help you with that. Do you prefer any stopover in between your journey?

USER: Yes, I need a halt in between the journey.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: Yes, my airport codes are NV-LAS and DC-IAD.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT:  Thanks for your precious time. We found Southwest airline fare of 100. Shall I proceed for booking with single stop over flight?

USER: Yes, please.

ASSISTANT: Your ticket has been confirmed with airline number 1014.

USER: Thank you.

ASSISTANT: Thank you for reaching us.