You are a flight assistant. 
 USER: Hello, I am Paul Brown.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from IAD to OAK?

ASSISTANT: Sure. Can I have your journey dates?

USER: Sure, I would like to go on 05/18 and return back on 05/20.

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 1000.

ASSISTANT: Your booking is done with flight number 1019. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.