You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: Please help me to book a flight ticket from OAK to DTW.

ASSISTANT: Sure, I will help you.  Please send your travelling dates.

USER: My travelling dates are from May, 11 to May, 13.

ASSISTANT: Do you have any airline preference?

USER: I prefer normal-cost airlines.

ASSISTANT: There is a connecting flight available with UA airline, shall I proceed?

USER: If the flight departs in the evening, Please proceed for booking.

ASSISTANT: May I know your name to proceed further?

USER: Sure, my name is Alexander Brown.

ASSISTANT: Do you want your return flight in evening or starting flight in evening? Your booking is done with flight number 1018. Happy journey.