Calling from javascript to WCF
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace ISTL
{
    public class MatchesListService : IMatchesListService
    {
        public bool AcceptRequestToChangeMatchTime(int matchId)
        {
            return MatchesListManager.AcceptRequestToChangeMatchTime(matchId);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace ISTL
{
    [ServiceContract(Namespace = "ISTL")]
    public interface IMatchesListService
    {
        [OperationContract]
        bool AcceptRequestToChangeMatchTime(int matchId);
    }
}

<system.serviceModel>
    <services>
      <service name="ISTL.MatchesListService">
        <endpoint binding="webHttpBinding" contract="ISTL.IMatchesListService"></endpoint>
      </service>
    </services>
    <behaviors>
      <endpointBehaviors>
        <behavior>
          <enableWebScript />
        </behavior>
      </endpointBehaviors>
    </behaviors>
  </system.serviceModel>

<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
    <Services>
        <asp:ServiceReference Path="~/MatchesListService.svc" />
    </Services>
</asp:ScriptManager>

ISTL.IMatchesListService.AcceptRequestToChangeMatchTime(matchId);