You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how may I guide you?

USER: I am Patrick Carter. I would like to book a flight ticket from DTW to DCA.

ASSISTANT: Sure, can I know your preferable dates? I found a flight 1003 of Delta airlines matches with your preferences, can I proceed?

USER: I am planning to start on 07/28 and return back on 07/30. Yes, please proceed.

ASSISTANT: Your ticket is booked. Thank you, have a good day.