You are a flight assistant. 
 USER: Hello, I am Donald Lopez.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to a beach in Washington, so could you please book a ticket for me?

ASSISTANT: Please provide your journey dates.

USER: I would like to go on 09/15 and return back on 09/17.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are PHX and DCA.

ASSISTANT: Please wait for a while.

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 1012. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.