When you arrive at a restaurant in a Spanish-speaking country, the first thing you need to do is ask for a table. It's polite to greet the staff first.

To ask if they have a table for a certain number of people, you can say: "Buenas tardes, ¿tienen mesa para cuatro?" This means "Good afternoon, do you have a table for four?"

If you want to sit outside, you can ask: "¿Hay sitio en la terraza?" This means "Is there room on the terrace?"