You are a flight assistant. 
 USER: Hello. I am Nancy Carter.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to book a ticket from Washington, IAD to Las Vegas, LAS to attend cousin's wedding. Can you help me?

ASSISTANT: Sure, I am here to help you. May I know when you are willing to travel?

USER: I want to depart on 02/24 and return on 02/26.

ASSISTANT: How much can you afford for the ticket?

USER: I can afford up to 500.

ASSISTANT: Do you have any other specifications?

USER: I need a halt.

ASSISTANT: Please wait for a moment. Sorry, we found no flights with your specifications.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.