You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please aid me to book a connecting flight from DCA to DEN?

ASSISTANT: Sure, provide me with the travel dates.

USER: Sure, I want to travel on July 21 and need to return on July 23.

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

USER: I already mentioned above.

ASSISTANT: IS there any class preference?

USER: No.

ASSISTANT: Are there any more preferences that you want to avail?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Emma Lee.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT:  Spirit Airlines with flight 1021 is providing service on your route with connecting flight and with the cost of 100.

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is booked where departure DCA 13:00 hours July 21 and arrival DEN 9:00 hours July 23.

USER: Thank you.

ASSISTANT: Thank you for reaching us.