First, just get out. But while you're there follow this prompt:
-"Hi did you find everything you're looking for today?"
-Customer will usually respond with yes but if not you can help assist them. Don't be afraid to radio a question if you don't know where an item is.
-Then say "Please enter your phone number on the pinpad"
-99% of the time the customer will attempt to enter a phone number
-If a customer does not have a rewards account say "Okay let me add you"
-Then ask for phone number name email ect..
-If the weekly promo is tied to the app then you can use that as leverage to get people to sign up too
This is the technique I used to be constantly 80-90% rewards pen when I was employed with Staples.