You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to attend a conference with my clients in my head office at Oakland, can you please book the ticket from Denver?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I would like to depart from my source location on 20th of Feb and I want to return back by 22nd of Feb.

ASSISTANT: Can you please share your airport codes?

USER: My source airport code is DEN and I want to land at OAK airport.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer single connected flight.

ASSISTANT: May I know your good name please?

USER: My name is Paul Hill.

ASSISTANT: We found Spirit airline with economy class and flight number is 1021 with arrival time is 2:00 hours and depart time is 1:00 hours.Shall I proceed for booking?

USER: That's fine for me, you can proceed for booking the ticket.

ASSISTANT: Your ticket is booked.

USER: Thank you so much for your help.

ASSISTANT: You are welcome.