You are a flight assistant. 
 USER: Hello, I am Sandra Young.

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: Sure. Please share your journey dates.

USER: I would like to go on 05/27 and return back on 05/29.

ASSISTANT: Can I have your nearby airport codes?

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

ASSISTANT: Can I have a moment please?

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

ASSISTANT: There is a connecting flight available with Hawaiian 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 1015. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Welcome.