Convert Our Reservation System To Twitter Bootstrap

I would like to convert our online reservation system to Twitter Bootstrap layout/style. This reservation system is hosted on the software company's website we are not allowed to make changes to the source code. They won't provide us the files so whoever is going to be working on it must use inspector or something similar and convert these pages to Bootstrap layout. We were told that the changes can be achieved using jQuery once completed they can upload these changes for us to their server. Here is the link to the reservation system. [login to view URL] I'm looking for options or suggestions on this. It's not mandatory but would like this reservation system to be responsive as well.