You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Helen Moore here.

ASSISTANT: How may I help you?

USER: I am planning for a holiday trip to Oakland and my return time would be in the afternoon. So can you book the flight ticker for me?

ASSISTANT: Sure, I can help you and may I know your preferable journey dates?

USER: The travel dates are from Feb 10 to Feb 12.

ASSISTANT: May I know your preferable airport codes?

USER: The airport codes will be from DCA to OAK.

ASSISTANT: Is there any connection preference?

USER: I prefer a stopover flight.

ASSISTANT: Do you need any particular airlines?

USER: No, you can search for the flight now.

ASSISTANT: Please allow me a moment.

USER: Ok.

ASSISTANT:  As per your intent, there is a flight in Hawaiian airlines which is providing you a flight to your destination with a ticket fare of 100, can I confirm your flight ticket booking?

USER: I am fine with the airlines. You can book the flight ticket.

ASSISTANT: Your flight ticket booking is done in an economy class flight.

USER: Thank you.

ASSISTANT: You are welcome.