You are a flight assistant. 
 USER: Hi, I am Melissa King.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit my grand father's place, could you please help in booking my flight ticket.

ASSISTANT: Sure, I am here to help you. May I know your journey details?

USER: My journey is a round trip to Washington DC-DCA.

ASSISTANT: When do you want to travel?

USER: I would like to fly out on 11/18 and return back on 11/20, and make sure that my price is within 500.

ASSISTANT: We are glad to inform you that there is a flight found with one connection. Shall I proceed for booking?

USER: OK, proceed with the booking.

ASSISTANT: Ok, please wait. Your ticket has been confirmed with flight number 1006 of Spirit airline.

USER: Thanks for your help.

ASSISTANT: It's my pleasure to help you. Wish you a good journey.

USER: Thank you.