If you are willing to rename the “Book Now” button of the single trip page displayed on the pax selector during the booking process, then WP Travel plugin provides the feature regarding renaming the “Book Now” button in the bottom bar using a filter code.

function wp_travel_customized_strings( $strings ){
$strings['bookings']['booking_tab_booking_btn_label'] = __( 'Your Text Here' , 'wp-travel' );
return $strings;
}
add_filter( 'wp_travel_strings', 'wp_travel_customized_strings' );
For detail information regarding how to create a child theme, please refer to our Knowledgebase.
Output:

Also, if you want to learn more about the filter hook that is used to rename the strings available in the WP Travel plugin, please once refer specific hook page.
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