[piosenniel]

Here's what I would do:

'Welcome! Will it be just the three of you having dinner this evening, or are there more in your party?'

Picks up three menus and the wine and spirits list. 'Would you like a table with a view of the waterfront, or would you prefer to be seated nearer the fireplace.'

Leads them to their preferred table, makes a little small talk, introduces them to their waitperson. Alerts the chef and owner that a special party has come in.

The owner then comes to their table and welcomes them, bringing a bottle of his best wine, and pours each a glass.

Now if I were a diner, I would resist the urge to go over and meet them - just leave them to enjoy their own company and the food. But what a story that would be for friends!!!!!!