Always stay calm, never become agitated, always act thoughtfully and attentively.
Be friendly and confident toward your guests, whatever the situation.
Keep to traditional values: ladies first, help seat your guests, open doors, greet your guests and bid them farewell…
Establish eye contact. That way you can quickly see what a guest might want and be able to respond before they have to ask.
It’s important to know when a guest needs your attention, but it’s equally important to notice when you aren’t wanted and the guest wants to enjoy a moment alone. And if their glass needs refilling, then allow them to do that themselves, that’s preferable in such a situation.