Add a drop down list of users metabox to a custom post type

Hey there,
Wondering if you can help me on something I'm a little stuck on. I have created a plugin that adds a custom post type to my dashboard. In that custom post type I am creating a series of metaboxes for the user to input. One of the metaboxes I want to create is a dropdown list of users. I know there is a function in wordpress that creates a list:

wp_dropdown_users();

However, I'm unsure on how I would go about saving the metabox info. Currently I have this in my php file:

function render_meta_boxes( $post ) {

		wp_nonce_field( basename( __FILE__ ), 'booking_details' );
        $prfx_stored_meta = get_post_meta( $post->ID );
// THE FORM
?>
<p>
    <label for="wedding-name" class="distractions-login-row-title"><?php _e( 'Package Name', 'distractions-login' )?></label>
    <input type="text" name="wedding-name" id="wedding-name" value="<?php if ( isset ( $prfx_stored_meta['wedding-name'] ) ) echo $prfx_stored_meta['wedding-name'][0]; ?>" />
</p>

<p>
    <label for="wedding-user" class="prfx-row-title"><?php _e( 'Example Select Input', 'prfx-textdomain' )?></label>
    <?php wp_dropdown_users(); ?>
</p>

	<?php }

   /**
	* Save metaboxes
	*
	* @since 0.1.0
	*/
	function save_meta_boxes( $post_id ) {

		// Checks save status
    $is_autosave = wp_is_post_autosave( $post_id );
    $is_revision = wp_is_post_revision( $post_id );
    $is_valid_nonce = ( isset( $_POST[ 'prfx_nonce' ] ) && wp_verify_nonce( $_POST[ 'prfx_nonce' ], basename( __FILE__ ) ) ) ? 'true' : 'false';

    // Exits script depending on save status
    if ( $is_autosave || $is_revision || !$is_valid_nonce ) {
        return;
    }

        // Checks for input and sanitizes/saves if needed
        if( isset( $_POST[ 'wedding-name' ] ) ) {
            update_post_meta( $post_id, 'wedding-name', sanitize_text_field( $_POST[ 'wedding-name' ] ) );
        }
        if( isset( $_POST[ 'wedding-user' ] ) ) {
            update_post_meta( $post_id, 'wedding-user', $_POST[ 'wedding-user' ] );
        }

	}

Can you help me out by suggesting a way to save the selected user?