If you are willing to rename Pax Selector which display after selecting date under booking tab in single trip page then WP Travel plugin provides feature regarding renaming Pax Selector under booking tab in single trip page using filter code as per your requirement.

To rename Pax Selector, you have to add following given code in the functions.php file of your child theme.

function wp_travel_customized_strings( $strings ) {
    $strings['bookings']['booking_tab_pax_selector'] = __( 'People Selector', 'wp-travel' );
    return $strings;
}
add_filter( 'wp_travel_strings', 'wp_travel_customized_strings' );

For detail assistance regarding creating child theme, please refer link.

Before:

After:

Note: You can replace word “Pax Selector” under booking tab with any name as per your requirement..

If you have any queries/confusions then please submit it to our Contact page.