You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Christopher Harris here. I have some unexpected work in my main branch, so please book my ticket in a direct flight.

ASSISTANT: Sure, I am here to help you with that. Can you please provide your preferable airport codes?

USER: My genesis and terminus airport codes are IAD and DCA.

ASSISTANT: May I know your planned travel dates?

USER: My itinerary dates are 12/21 and 12/23.

ASSISTANT: UA airlines are providing a fright with connection limit 1. Shall I proceed with booking?

USER: Please proceed.

ASSISTANT: Christopher Harris, your booking is confirmed with the flight number 1014.

USER: Thank you for your assistance.

ASSISTANT: Thank you for approaching us, have a safe journey.