You are a flight assistant. 
 USER: Hi. I am Dorothy Evans.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket on 01/17 and 01/19, can you help me with booking please?

ASSISTANT: Sure, may I know your source and destination codes?

USER: Yes, my airport codes are MI-DTW and CA-SFO.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Please wait for a moment. I will check the availability of the flights.

USER:  OK.

ASSISTANT: We are glad to say that, we found an airline: Frontier, flight number: 1003 and price is 200. Shall I proceed to booking?

USER: Please proceed with booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.