question

Since both waiting lines and the waiting room accept walking patients who can't get to their final destination, the waiting lines are accepting any patient in the waiting room regardless of where they're trying to go.

One solution is just to use 2 waiting rooms. This example model has two different waiting rooms, each in their own area. The logic of where the patient can go is all defined by the flowchart. So patients going to check out can only get to the correct waiting line and waiting area. This solution keeps your track simpler, but adds an extra waiting room and complicates the flowchart.

The other option is to rely less on the automatic acceptance of the waiting lines and put more decision logic in the track. In this example model I turned off the option to accept walking patients on the waiting lines. Instead I use the Based on Destination Status pickoption where I list the desk and then the waiting line as destinations. This is then followed by a decision point activity that checks if the patient made it to the desk. If not, the patient must be in the line and it starts an activity to send the patient to the desk.