Greetings of the day!
If you only want to change the content, then you can easily change it from the "Translations" tab.
Here is the link, please have a look: https://qloapps.com/managing-translations-in-qloapps/
But if the booking process is different then there will be a need for customization.
If you want to proceed with it then please raise a ticket by clicking on this: link https://webkul.uvdesk.com/en/customer/create-ticket/.