You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Library of Congress to collect some information from old Newspapers at Washington, which helps me to write an Article about corruption. Can you please help me for booking?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: My travelling dates are Sept 20 and Sept 22.

ASSISTANT: Could you let me know your airport codes?

USER: Sure, my source airport code is DEN and destination airport code is DCA.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a halt.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: We found a flight on Delta airline, flight number as 1018 with the fare of 100.

USER: Ok, please confirm.

ASSISTANT: May I know your name for booking ticket?

USER: Sure, I am Paul Collins.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for availing us.