Customize recurrent bookings price display message.

function.php

add_filter('phive_booking_booked_price_details','phive_booking_booked_price_details',11,3);

function phive_booking_booked_price_details($price_details,$product_id,$post_details)
{
	$custom_messages="This is a recurrent booking. Your upcoming bookings are : ";
	$new_message = "This class series meets at the green date above, and:";
	if(isset($price_details['custom_messages']) )
	{
		$price_details['custom_messages'] = str_replace($custom_messages, $new_message, $price_details['custom_messages']);
	}
	return $price_details;
}