You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you for the day?

USER: Carol Anderson here. Please help me out in booking the ticket from DFW to MSP.

ASSISTANT: Sure, I am mirthful to help you with that.  May I know your preferable travel dates, please?

USER: My trip dates will be Feb 2 to Feb 4.

ASSISTANT: Do you have any other specifications?

USER: Yes only one requirement, I need 1 lay by with in my route.

ASSISTANT: Please hold for a while, let me check the fights availability.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available as per your requirements.

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

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