Room Availability validation in list

Below method will return true or false

false means room is already booked

true means room is available

var validationflag=CheckAvailabbleRooms("4/30/2018 1:10 AM", "4/30/2018 2:10 AM", "room1");


function CheckAvailabbleRooms(startdatea, endates, roomss)
{

    var val_flag = true;
    var companySiteUrlLink = titanForWork.getQueryStringParameter("CompanySiteUrl");
    var startdateaes = new Date(startdatea);
    var tStart = startdateaes.toISOString();
    var endatestv = new Date(endates);
    var vEnd = endatestv.toISOString();//EndDate
    var filterData = "&$filter=EndDate ge datetime'" + tStart + "' and Rooms eq '" + roomss + "'";
    var listName = 'ListName';
    var siteURL = companySiteUrlLink + "/_api/web/lists/getbytitle('" + listName + "')/items?$select=ID,Title,Rooms,Location,EventDate,EndDate" + filterData;
    console.log(siteURL);
    $.ajax({
        url: siteURL,
        headers: { Accept: "application/json;odata=verbose" },
        async: false,
        success: function (data) {
            var items = data.d.results;
            // alert(items.length);
            for (var index = 0; index < items.length ; index++) {
                if (items[index].EventDate <= vEnd) {
                    val_flag = false;
                    var uuu = new Date(items[index].EventDate);
                    console.log(items[index].ID + "-------" + uuu);
                }
            }
        }, eror: function (data) {
            console.log($('#txtSomethingWentWrong').val());
        }
    });
    return val_flag;
}