Adding a datepicker to a search form for WP Real Homes theme

Hello. I use a real estate theme called "Real Homes" in my wordpress website for different purpose. I rent accomoditions in my website with "Pinpoint Booking System" plugin. I add calendars for each property and this "Pinpoint Booking System" plugin satisfy my all needs. But there is one thing I need to do. The Real Homes theme has a search engine for Real Estate purposes. So there are no search fields as Check-in and Check-out dates in the search engine of the theme. I want you to add Check-in and Check-out fields to the theme's search engine and list the results according to my selections from the back-end. There should be a place where I can make booked and available dates from the back-end for each property. So I will define the available and booked dates. And when the user makes search with the search engine, he will see the results only with available properties for those dates. So you don't have to connect this booking plugin and the theme. I will define same dates with the booking plugin and with the theme's back-end datepicker area. So they wont work together but I will define available and booked dates 2 times which is okay for me. I have a low budget thats why I don't want you guys to connect the theme and the plugin. Thanks.