You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Katherine Turner here. Can you please book a flight ticket from LAS to DEN?

ASSISTANT: Sure, may I know your travelling dates, please?

USER: My trip dates are 11/12 and 11/14.

ASSISTANT: May I know your connection limit?

USER: I want a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the afternoon. I prefer to travel in normal cost airline.

ASSISTANT: There is a connecting flight-1004 in Spirit Airlines with a fare of 200. Shall I proceed?

USER: Please proceed if return is in afternoon.

ASSISTANT: Ok, please wait for a while. Sorry, according to your information, there are no flights available on this route as per your travel dates.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for reaching us, have  a great day.