You may not have missed the boat (depends on the circumstances of your friends "no-show"). But your friend will have missed this sailing.
Provided your friend gave adequate notice and reason for inability to attend, it isn't the end of the road. To mix metaphors.
However, they will put your friend at the bottom of the list (and it's very long at present) before offering a re-interview. The same thing happened to a "friend" of mine.
The KA people feel that they owe it to other queued, aspiring candidates to give them all their interview before going back to the start of the queue.