You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I am David Hill. I want to book a flight ticket to meet my uncle in Las Vegas, will you help me in booking a flight ticket with a price limit of 200?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Could you please share your airport codes?

USER:  I need to leave from my nearest airport IAD to reach LAS.

ASSISTANT: Let me know your travelling dates.

USER: I want to travel on 01/31, and need to catch return flight on 02/02.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: We found a flight with single connection and price is 100 of 1020 flight. Shall I proceed for booking?

USER: Proceed with the booking.

ASSISTANT: Your ticket has been confirmed with AA airlines.

USER: Thanks for the help.

ASSISTANT: Thank you for choosing us.