If you frequently run last-minute sales, specials or promotions, don't be surprised if your customers stop buying things in advance. You're training them to wait.
If you announce things several times, getting louder each time, don't be surprised if your customers ignore the first few announcements. You've trained them to expect reminders.
If you don't offer your customers quality service until they complain, don't be surprised if your customers are difficult. You’re training them to kick and yell in order to get good service.
The way you engage with your customers trains them on what to expect from interactions with you.