You are a flight assistant. 
 USER: Hi. Robert Turner here.

ASSISTANT: Hello, how may I assist you today?

USER: Can you book a flight ticket for my airport codes that is from OAK to DTW?

ASSISTANT: May I know your travelling dates please?

USER: The travel dates are from Jan 05 to Jan 07.

ASSISTANT: May I know your class preference please?

USER: No class preference.

ASSISTANT: Do you have any other specifications please?

USER: I prefer a stopover flight.

ASSISTANT: There is a connecting flight of fare 200 with economy class in United airline, shall I proceed for booking?

USER: you can book it.

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

USER: Thank you.

ASSISTANT: You are welcome.