Wordpress Plugin - bookly - Adjustment

we are currently using the Wordpress plugin bookly to manage appointments. We IT experts who needs a hand to adjust this plugin. You will find a demo of the bookly Wordpress Plugin in the following link [login to view URL] We need two adaption to this plugin. #1 lookup customer before create a new one current problem is that every time an appointment is booked it creates a new customer. Before a new customer is created it should check if a customer with the "name" or "phone" or "email" exists. If it exists -> it should create the new appointment with existing customer_id else -> create new customer #2.1 add additional checkbox for service add a checkbox "use existing appointment" in the backend. The value has to be saved in the service table. #2.2 adjust the frontend query of the free appointment slots if customer select a service which has this checkbox selected it should only show existing free appointment of this service. Background Information: we want to define our customer appointment where 2-10 people can attend which they should select. Without this function customer will create a new appointment instead of using the existing one. You can be sure there will be a follup up project. We will provide you the source code of the plugin and database. You will have to send us the adapted source files. We will NOT provide url of our homepage or login data to our servers.