public function buildQuickReply()
    {
        if (!empty($this->quickReply)) {
            return $this->quickReply;
        }

        $items = [];

        foreach ($this->buttonBuilders as $buttonBuilder) {
            $items[] = $buttonBuilder->buildQuickReplyButton();
        }

        $this->quickReply = ['items' => $items];

        return $this->quickReply;
    }