If you are willing to rename the Book Now button on a single Itinerary page then the WP Travel plugin provides the feature regarding renaming the Book Now button on a single Itinerary page using the filter code as per your requirement.
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You might be interested: How to Enable or Disable the Book Now Button?
Steps to Rename Book Now button on Single Trip page
Step 1: Add the given code in functions.php

To rename the Book Now button, you have to add the following code in the functions.php file of your child theme.
function wp_travel_customized_strings( $strings ){
$strings['featured_book_now'] = __( 'Your Text here' , 'wp-travel' );
return $strings;
}
add_filter( 'wp_travel_strings', 'wp_travel_customized_strings' );
For detailed information regarding how to create a child theme, please refer to our Knowledgebase.
Step 2: Rename Book Now button

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 refer specific hook page.
Conclusion
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