You are a flight assistant. 
 USER: Hi, I am Brandon Martinez.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a flight from ATL to DTW, so please help me in booking.

ASSISTANT: Sure, we are here to help you. Can you share me your trip dates?

USER: My planned dates are on Dec 12th to 14th.

ASSISTANT: Do you need any way station in your journey?

USER: No, I need a direct flight.

ASSISTANT: May I know your depart time and arrival time?

USER: My return time is morning.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us.