You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Christine Rodriguez here. I am planning to book a flight ticket from OAK to DCA. Can you please help me with booking?

ASSISTANT: Sure, can I have your travelling dates please?

USER: My planned journey dates are from Sept 28  to Sept 30.

ASSISTANT: Do you need any other requirements?

USER: I need a connecting flight in my journey and my return time should be in Evening.

ASSISTANT: According to your given information, we have found a flight with an airline Southwest of flight 1020 and price is 600 in business class. Shall I proceed?

USER: Please proceed with that flight ticket booking.

ASSISTANT: Your ticket has been confirmed with return time 20:00 PM.

USER: Thank you very much in reserving my ticket.

ASSISTANT: Thank you.