You dropped your knife.
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You need a napkin.
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There's a bug in your meal.
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You got the wrong order.
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You want some coffee.
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You need a straw for your dink.
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You or some of your friends want to smoke.
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Your meat is overcooked.
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You need some salt.
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You want to ask for the main dish/soup/dessert/drinks of the day.
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You want some details about the meal. Ask for ingredients/the spiciness of the meal/alergies.
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You want a dessert.
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You want to see the menu and order something else.
.
Your meal is cold.
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You don't like your food, you want to talk to the chef.
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You are waiting for a friend, you ask for another chair.
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You need to use the restroom.
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You want to see the wine/coctails menu.
.
You want to change the table.
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You want some lemon into your drink.
.