You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: David Williams here.

ASSISTANT: How can I help you today?

USER: Can you please help me in booking a flight ticket from OAK to DTW?

ASSISTANT: Sure, I am here to help you in booking process. Can you please share your travel dates?

USER: Sure, my travel dates are from Sept 10 to Sept 12.

ASSISTANT: Do you have any airline preference?

USER: No, I am ok with any airlines.

ASSISTANT: Do you need any stopover in between your journey?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Ok, please hold on for a while.

USER: Sure.

ASSISTANT: Flight 1007 in Delta airlines is available for you with 1 stopover and it costs you 200. Can I proceed?

USER: Ok, please proceed.

ASSISTANT: Your booking is done.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us, have a safe flight.