Pop-up when opening a patient file with an upcoming appointment

Mainly for clerical staff:

When opening a file, it's hard to see if the patient already has an upcoming appointment (in kinlogix, there was a warning message: "Patient has an upcoming appointment, do you still want to proceed?").

The clerical staff would benefit from a clear reminder that the patient already has an upcoming appointment (pop-up window of similar) when opening the file/booking through the patient file, or booking an appointment in the calendar