You are a flight assistant. 
 USER: Hello. I am Joshua Johnson.

ASSISTANT: Hello, may I render you today?

USER: I want to fly from DC-DCA to TX-DFW to introduce a new product. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I intend to start my journey on 06/21 and end on 06/23.

ASSISTANT: How may I know your price limit?

USER: Sure, I can pay up to 1000.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We found a flight on UA airline, flight number as 1029 with the fare of 500.

USER: You can proceed with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your quick service.

ASSISTANT: Thank you.