public function sendMessageByUserId($receiverId, $message)
    {
        if ($conversationId = $this->isConversationExists($receiverId)) {
            $message = $this->makeMessage($conversationId, $message);

            return $message;
        }

        $convId = $this->newConversation($receiverId);
        $message = $this->makeMessage($convId, $message);

        return $message;
    }