You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I support you today?

USER: My name is Lisa Johnson, I want to book a flight for round trip from Washington DC-IAD. Can you book a flight for me?

ASSISTANT: Sure, do you have any fare limit?

USER: My budget is 500 for flight ticket.

ASSISTANT: May I know your trip dates?

USER: I will fly on 02/02 and return on 02/04.

ASSISTANT: There is a UA airline available with flight number 1005 and fare is 100 having a lay by. Shall I confirm it?

USER: Please proceed with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for helping me with booking.

ASSISTANT: Thank you for reaching us.