Can clients book an appointment as a guest?

Customers have the option to browse your services as a guest - Timeslots will display as available, but unclickable until the customer logs in or creates an account. 

Our intention with this design is to allow all interested customers to see all available timeslots, but they are required to enter their information in order to reserve the time. It would be unsecure to allow customers to select timeslots without giving their information - This is because the system will reserve a clients chosen timeslot for 15 minutes to allow them to finish booking. If they could do this without logging in, people would be able to reserve time slots in your calendar without giving their information (AKA, not being serious about booking the time).