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add_filter( 'easy_booking_loop_add_to_cart_link', 'easy_booking_loop_add_to_cart_link', 10, 2 );

function easy_booking_loop_add_to_cart_link( $content, $product ) {
    $link    = get_permalink( $product->id );
    $label   = __( 'Your custom text', 'easy_booking' );
    $content = '<a href="' . esc_url( $link ) . '" rel="nofollow" class="button">' . esc_html( $label  ) . '</a>';

    return $content;
}