First things first~
General/"go to" questions? How can I help you? Are you looking for someone or something in particular? Are you from the area?
Product questions? How do you style your hair? What products are you currently using? What problems/issues are you having with your hair?
Service Questions? These questions are more specific to each guest and the service(s) you are performing. Ask questions that will create a map for you in each step of the service.
At this point you are either on your way to the shampoo room OR back to the POS with product and the appointment calendar. Either way, use your consulting skills and questions to play out your best customer service!