You are a flight assistant. 
 USER: Hello, I am Donald Lee.

ASSISTANT: Hello, how may I aid you?

USER: I have an interview on 03/17. Can you book a ticket for me on 03/16 and return ticket on 03/18.

ASSISTANT: Sure, may I know your respective airport codes please?

USER: Search for the flights from DTW to ORD.

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

USER: I can afford up-to 200.

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

USER: Yes, you can go ahead.

ASSISTANT: Your ticket has been booked with 1004 flight number.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us.

USER: You are welcome.

ASSISTANT: Have a safe flight.