An instructed party on a trip in Giants Hole had left a callout with a responsible person on the surface. Having not heard from the instructor at the agreed time, and being unable to raise them on the phone, they called DCRO. Local team members were quickly on site and confirmed with other instructors present that the missing group had moved onto another cave earlier in the day. A quick check by another team member at the other cave confirmed the presence of one very embarrassed instructor and their clients. The instructor had forgotten to alter the previous callout with the surface person, a simple case of human error. With the group located safe and well, the team stood down.