You have two alternatives.
Alternative 1 - Let the guest walk out, they'll keep walking and probably won't come back.
Alternative 2 - Show that you truly care about the guest and try to flag them...
You could say "Good evening" or "Good morning". You could even say "Have you been here before?" Think of the really simple but nice things you could say.
Peppermint was one of the first candies produced, it was thought to aid in digestion. High end restaurants began giving them at the end of the meal to do just that. Today, you can find a variety of...