You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have a business meeting in Philadelphia. Can you help me for booking a flight ticket from DTW to PHL?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are Aug 18 and Aug 20.

ASSISTANT: Do you have any preferences?

USER: I prefer to book a economy class.

ASSISTANT: Do you have any other preferences?

USER: I need a single connecting flight.

ASSISTANT: May I know your name?

USER: My name is Barbara Carter.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Flight-1004 is available in southwest airlines with single connection and the ticket fare is 100. Can I proceed?

USER: Ok, proceed for booking.

ASSISTANT: Your booking is confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.