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

ASSISTANT: Hello, how may I serve you?

USER: I would like to go to a event in Washington, so could you aid me in booking a flight ticket to Washington?

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

USER: Sure, I would like to go on 07/23 and return back on 07/25.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are CLT and IAD.

ASSISTANT: 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 500.

ASSISTANT: Your booking is done with flight number 1010. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.