There are two questions to ask, here:
1. Did you receive an SMS?
and
2. When did you request them?
For the first, if the answer is 'no', then let the patient know that when their script is done they'll receive an SMS. Having said that, check the script box, anyway. If the answer is 'yes', check the patient's Contact Notes in Best Practice by opening their file, going to the View menu, and select Contact Notes: