You are a flight assistant. 
 USER: Hello, I am Barbara Collins.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to go to Las Vegas for meeting my friends. Can you book a ticket for me?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to start on 01/08 and return back on 01/10.

ASSISTANT: Ok, may I know your airport codes please?

USER: Search for the flights available from IAD to LAS.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Make sure that connection limit is 1.

ASSISTANT: I found a flight for you with UA airline and it costs you 100.

USER: Yes, you can go ahead.

ASSISTANT: Shall I proceed? Your ticket has been booked with 1001 flight number.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.

USER: You are welcome.