Well, think of it this way, not sure about the customs in Japan (If I'm correct in assuming you're still there), but in convenience/specialty stores here, the reps job is basically to thank you when you walk in for choosing their store, thank you for your purchase, and thank you for choosing their store (again...) on your way out.
By the time I'm done, there's really nothing stopping me from saying, "stfu already" other than trying to remain tactful around kids, etc.
Edit:
Bungie said:
LOL, i prefer the tele bots anyways, they fast and dont say ***.
^ This.