It's best to actually hear the call. Considering only those words, maybe Declined will be better. Still, a single word can change the outcome. Also, I don't think follow-ups are relevant for Inbound, as of yet. We shouldn't confuse them with Outbound.
It could be a Soft appointment, there was no actually confirmation customer was coming, no date / no timeframe BUT a call back to set an appointment was not present, meaning an agreement was made about it. Again, for tricky situations is ok to give a GA credit, until admin / OV update. Don't expect every scenario to be in the overview though, just review by common sense.
One more thing...if you guys have access to the Service appointments categories, it is stated there that if the caller says "OK" concerning a walk-in unscheduled appointment, then the appointment is considered as Booked. But that's for Service.