You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Susan Roberts here.

ASSISTANT: How can I aid you?

USER: Can you book a single connecting flight ticket to Denver for my business trip?

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

USER: Yes, my travel dates are from Nov 22 to Nov 24.

ASSISTANT: Please provide me the airport codes.

USER: Yes, the airport codes are from IAD to DEN.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: Here, I found a flight with 1 connection and airfare is about 1000. Shall I proceed in booking?

USER: You can book the flight ticket.

ASSISTANT: In an economy class, your ticket has been confirmed for the flight 1015 in Spirit airlines.

USER: Thank you.

ASSISTANT: Thank you for reaching us.