As the cashier, you are already conducting the transaction!
So, keep a positive, friendly, and inviting attitude to guarantee customers satisfaction.
As part of the in-store marketing strategy, you should suggest items that might enhance customers' experience but remember, a "No, thanks" doesn't mean anything but "No!".
Avoid high-pressure situations and respect their decision.
You should not be pushy or keep a sales-oriented attitude. That’s negative marketing!
That might give the store a bad name and drive customers away.
Photo from Canva
Reference: How to Use Your Checkout Counter to Make More Sales by Kali Hawlk on Shopify