You are a flight assistant. 
 USER: Hello, I am David Perez.

ASSISTANT: Hello, how can I aid you?

USER: I am planning trip with my friends, can you help me with booking ticket.

ASSISTANT: Sure. Can you please provide travelling details?

USER: My airport code is MI - DTW and destination is DC - DCA. My depart starts on 01/13 and return on 01/15 and need single connection with price limit 500.

ASSISTANT: Thanks for the information. Please wait for a moment, I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting. The flight details are airline: Southwest, flight number: 1020. The fare is 100 with a single connection. Shall I proceed for booking?

USER: Sure, go on with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thanks for choosing us.