You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Donna Walker here. Can you book a flight ticket for my airport codes that is from DEN to ORD?

ASSISTANT: May I know your travel dates?

USER: The travel dates are from Dec 09 to Dec 11.

ASSISTANT: Do you have any specifications?

USER: I would like to prefer a stopover in my journey.

ASSISTANT: Flight-1002 is available with American airlines having single connection and the ticket costs you 100 only in economy class. Are you comfortable with this flight?

USER: You can book the flight ticket.

ASSISTANT: Your ticket is booked successfully. Flight departs at 04:00 hours and arrives time is at 12:00 hours.

USER: Thank you.

ASSISTANT: Thank you.