You’re ordering lunch at a restaurant. You’re on a diet, so you’re trying to eat healthy. You order a salad but you want to put the dressing on it yourself so that you can control the amount. You say:
I'll have a chef’s salad, dressing on the side please.
ordering food, restaurants, waiter 
You're a waiter at a restaurant. A customer is complaining about her meal, but she's already eaten it so you can't take it back. You want her to be satisfied, so you offer a free dessert:
May I offer you a complimentary dessert?
You ordered a steak at a restaurant and asked for it to be cooked medium-rare. When your dinner comes, the steak is over-cooked. You call the waiter over to your table and say:
I hate to cause trouble, but I ordered this medium-rare.
complaint (formal), food, meat, restaurants, waiter, 日本語サポート At a restaurant, your friend ordered a steak cooked medium-rare. But when he got it, it was over-cooked. He tells you about it, and you think he should complain to the waiter about it. You say:
I would say something to the waiter.
complaint (formal), conditionals, food, restaurants, suggestion, waiter 