Yes and no. Slottable allows you to register attendees and redirect them to any page of your choice after registration (e.g., your order form). Once they register, their data will be pushed into your CRM.
However, if a user does not complete the order form, they will still be considered registered in Slottable. In this case, you would need to manually remove them from Slottable and update their contact record in your CRM as needed.