add custom fields for specific page template in wordpress.

/*Custom filed for specific page templae (sub service page)   */
add_action('add_meta_boxes', 'add_product_meta');
function add_product_meta()
{
    global $post;

    if(!empty($post))
    {
        $pageTemplate = get_post_meta($post->ID, '_wp_page_template', true);

        if($pageTemplate == 'servicepage.php' )
        {
            add_meta_box(
                'product_meta',
                'Service Information',
                'display_product_information',
                'page',
                'normal',
                'high');
        }
    }
}

function display_product_information()
{
     global $post;
        $service_price= get_post_meta($post->ID, 'service_price', true);
?>
<div class="row">
<div class="form-group col-sm-12">
    <label for="service price" style="vertical-align:top;">Service Price</label>
    <input type="text" name="service_price" class="form-control" value="<?php
            if(isset($service_price)) {
                echo $service_price;
            }
        ?>" />
   
 </div>
</div>
  <?php
}

function service_meta_save($post_id, $post) {
    global $post;
update_post_meta($post->ID, 'service_price', $_POST['service_price']);
}
add_action( 'save_post', 'service_meta_save', 1, 2);