You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: Helen Thomas is my name. I want to book a flight ticket to Atlanta, GA - ATL, to submit my research record at Atlanta university.

ASSISTANT: OK.

USER: Can you aid me for booking from Washington, DC - DCA?

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are 10/23 to 10/25.

ASSISTANT: Do you have any restrictions?

USER: Make sure that the price limit is 500.

ASSISTANT: There is a flight 1025 in Spirit airline and price 100 with a connection. Shall I proceed?

USER: Ok, you can proceed for booking.

ASSISTANT: Ok, Reservation of your ticket has been done.

USER: Thank you.

ASSISTANT: Thank you.