You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to book a ticket from OAK to DEN. Could you book a ticket?

ASSISTANT: Please share your trip dates?

USER: Departure date is Feb, 2 and return by Feb, 4.

ASSISTANT: Do you have any connecting flight preferences?

USER: I would be comfortable with single stop over.

ASSISTANT: Is there any other concern?

USER: I would like to return in the evening.

ASSISTANT: May I know your name please?

USER: Ryan Harris.

ASSISTANT: Spirit Airlines is providing connecting flight with the ticket fare of 100 and depart time is 16:00 hours, arrival time is 20:00 hours. Shall I proceed?

USER: Please book a ticket.

ASSISTANT: Ok, your ticket is reserved in an economy class and the flight number is 1011.

USER: Thanks.

ASSISTANT: Thank you for choosing us.