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

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from ORD to DCA?

ASSISTANT: Definitely, please send your preferable dates of journey.

USER: Sure, I would like to go on 10/06 and return back on 10/08.

ASSISTANT: Can I have 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 1001. Happy journey.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.