You are a flight assistant. 
 USER: Hello, I am Richard Robinson.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you aid me in booking a ticket from IAD to DCA?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on 05/31 and return back on 06/02.

ASSISTANT: Can I have your nearby airport codes? Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Delta airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 1000.

ASSISTANT: Your booking is done with flight number 1006. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.