There are certain information that the dispatcher will ask when you call for help. Certain guidelines have been given but the best guideline would be is to simply remember that the problem is about your patient. So most probably the thing to remember is the word PATIENT.
This is actually an acronym and by remembering this word, you can give this information to the dispatcher.
P - roblem of the patient
A - ssessment
T - ime of onset
I - dentify exact location
E - xposure to risk, or emergency
N- ever leave the patient
T- reatment or first aid given
This would somehow give you an idea on the basic information that you can provide the dispatcher upon calling for emergency medical services.