<?php
    $wp_post = null;
    $wp_post = new WP_Query(array(
        'post_type' => 'slider',
        'order'     => 'ASC',
        'posts_per_page'=> -1
    ));

    if( $wp_post->have_posts()){
        $x=0; //for slider condition
        while ( $wp_post->have_posts()){
            $x++; //for slider condition
            $wp_post->the_post();
            $slider_caption = get_post_meta( get_the_ID(), '_office-master_slider_caption', true ); ?>

           //html content goes here

    <?php    }
    }else{
        echo 'No posts';
    }

    wp_reset_postdata();


    ?>