Dear Dunstan,
We have check several times and we don't have any reservation on your name or your friends' name. None of you have booked with us the trek or any other service. Maybe Mr. Sciberras booked through another agency and doesn't remember which one.
If he had book with us, it would be easy to retrieve our confirmation email and reservation number. Just enter his email on this page and he will receive that information (on the section Lost your information? ): http://www.inca-trail.com.pe/customer/index.php?lg=en . If he doesn't it means he didn't book with us, as I am telling you.
Best regards,