Is there a user area for the customer to manage his reservation?
With the current version of HBook, a customer does not have any access to view, amend or cancel his reservation. He will need to contact you if he wishes to make some changes to a booking.
From the admin, you can modify the dates of a stay, the number of guests, the extra-services, etc. You can as well send email, if you wish to confirm the changes to a guest that asked to modify his reservation, for example.