Totaly new to Magento and working with version 1.9.3.8.

I am trying to change the layout of product review page from 2columns to 1column by editing the review.xml file present in the following path `default/layout/review.xml`.

This is what my code looks like. 

    <review_product_view translate="label">
        <label>Catalog Product Review View</label>
        <reference name="root">
        	<action method="setTemplate"><template>page/1column.phtml</template></action>
        </reference>
        <reference name="content">
        	<block type="review/view" name="review_view"/>
        </reference>
    </review_product_view>

The changes are not reflecting. Am I missing something somewhere?

Thanks in advance!