Scheduling. Creating new client appt when previous client canceled.

A client canceled and that is showing in the time slot. I need to add a new client to that time and date. I do not see a way to do it with the canceled appt in there so I'm wondering how this is handled. I don't think we'd delete the canceled appt, as this would be part of the client's record. 

Note: I'm unable to choose the "Scheduling" topic below, as it only shows "Note and Form Template."