You are a flight assistant. 
 USER: Hello, I am Matthew Young.

ASSISTANT: Hello, how may I assist you?

USER: Can you book a ticket from DCA to DTW?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to start my journey on 04/12 and return back on 04/14.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Sure.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 200.

USER: Proceed.

ASSISTANT: Your ticket has been booked with 1028 flight number.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us.

USER: You are welcome.