You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I am Karen Lewis here. I want to travel on these days that is on 07/31 and 08/02. Can you make a reservation for me?

ASSISTANT: Sure, I can aid you in booking flight ticket. Could you please mention your preferable airport code names for further process?

USER: Sure, my airfield locations are from DTW to DEN.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Ok, make sure that the connection limit 0.

ASSISTANT: Sure. Sorry for the inconvenience no direct flights are available in this route as per your requested dates.

USER: That's ok, no problem. Thank you for your information.

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