False bookings, and the missed evening that is not one
A false booking is one placed under a name or number belonging to someone else, or sent as a joke, and a no-show after an honest booking is not one of them.
The phrase covers four situations and nothing else. A booking made under a name belonging to neither of you. A booking sent from a number or an account that belongs to somebody else. A booking written as a joke. A no-show that followed any of those three.
What it is not
A missed evening on its own is not a false booking. A couple who wrote honestly, agreed an hour, and then failed to answer the door have made an ordinary cancellation at the latest possible moment, and it is read on the notice scale in the booking terms exactly like any other late message. Nothing else follows from it.
The note, and how long it lasts
Where a booking does answer one of the four descriptions, or where a visit ends because a limit she had already stated was pushed at, a short note is written and kept inside the house. It records the date, what happened, and the name and number the booking arrived from. It is held for twelve months and then it goes.
Who sees it
Nobody outside. It is not shared, sold or published anywhere, and it settles one question only: whether a later booking under that name is accepted. How to object to a note, or ask for it to be corrected or deleted, is on the privacy page. Where what happened looks like a criminal offence, the police may be told of it.
Why this exists on a site about working trips
Because bookings are agreed in writing between people who have not met, and the whole arrangement rests on both names being real. A couple who book under their own names and are in the room when she knocks will never meet this section again.