You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please help me to book a flight ticket from DFW to LAS?

ASSISTANT: May I know your travel dates?

USER: My travel dates are Sept 03 and Sept 05.

ASSISTANT: Do you prefer connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer a business class.

ASSISTANT: May I know your good name?

USER: I am Scott Lopez.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.