code: function performDelete(node,dialog,msg, config) {
      var params = {};
      var message = '';
      node.status({fill:'blue', shape:'dot', text:'requesting delete of a dialog instance'}); 
  
      if (!config.dialog || '' != config.dialog) {
      
        params.dialog_id = config.dialog;
  
        dialog.deleteDialog(params, function(err, dialog_data){
            node.status({});
            if (!err) {
                message='Dialog deleted successfully';
                msg.dialog = dialog_data;     
                msg.payload = message;
                node.send(msg);
            } else if (err && err.code==404) {
                message='Dialog already deleted or not existing (404)';
                node.status({fill:'green', shape:'dot', text:message});      
                msg.payload = message;
                console.log(err);
                node.error(message, msg);
            } else {
                node.status({fill:'red', shape:'ring', text:'call to dialog service failed'}); 
                node.error(err, msg);
                console.log(err);
            }
        });  
      } else {
        message = 'Dialog Id not specified';
        node.status({fill:'red', shape:'ring', text:message});    
        node.error(errmessage, msg); 
      }   
    }
docs: This function delete an existing dialog instance.