You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please reserve me a flight ticket from DFW to DEN.

ASSISTANT: May I know your travel dates?

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

ASSISTANT: Do you have any connecting limit preferences?

USER: I prefer connecting flight for this trip.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Eric Hall.

ASSISTANT: No flights found in our database at the moment as per your preferences.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.