Je voudrais une table pour deux personnes, s'il vous plaît.

Pronunciation: zhuh voo-dreh oon tah-bluh poor duh pair-sohn, seel voo pleh.

Meaning: I would like a table for two people, please.

This is the essential phrase for making restaurant reservations in French; using the conditional "je voudrais" shows politeness and is always appreciated by French hosts.