If previous homeowners want you to house sit for them again but are contacting you directly, you can manually add the dates to your booking calendar, however the system won't know who they are - you will just be blanking out dates in your calendar so that other home owners will know you are booked for those dates. Instructions for doing this are at the top of your "Bookings" page.

Alternatively, for the system to recognise this booking so that you can leave reviews for each other, those homeowners need to create a new ad. You'll then apply as usual, and when they invite you and you accept, the booking will automatically be added to your calendar.