You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have planned a get together party with my college friends at Washington. Can you please book a ticket with a price limit of 500?

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are on 09/23 to 09/25.

ASSISTANT: Can I know your travel codes?

USER: Sure, my airport codes are from LAS to IAD.

ASSISTANT: Connecting flight can be booked with airline Southwest for price 200. Shall I book a ticket?

USER: Please book my ticket on the name of Carolyn Williams.

ASSISTANT: Ok. Ticket is booked by name Carolyn Williams. Flight number is 1025.

USER: Thank you.

ASSISTANT: Thanks.