Hello Gil Ronen,

Thanks for reaching out to us.

You would need to create another employee, assign him to the same service and set the work hours to weekends (holiday) with the higher pricing. In this way, when the customer is about to book the weekdays, he will see one pricing. When he wants to book the weekends or holidays, he will see the higher pricing. Of course, make sure that the employee selection is hidden (Customize / Step by Step 2.0 / Service Selection / Options)

Currently, this is the only workaround, but please feel free to search through our feature suggestion page,  to see if someone may have already suggested this feature. If you can't see it, feel free to add your suggestion there, and as more people vote, the feature will move higher on the priority list.