Formal — to staff
Restaurant · Izakaya
You
席が空いているようですが、すべて予約席ですか?
せきがあいているようですが、すべてよやくせきですか?
It looks like there are empty seats, but are they all reserved?
Romaji: Seki ga aiteiru yō desu ga, subete yoyaku-seki desu ka? / Reply Romaji: Mōshiwake gozaimasen. Tadaima manseki de gozaimasu. Moshi yoroshikereba, o-denwa bangō o itadakereba akishidai go-renraku dekimasu ga.
Reply
申し訳ございません。ただいま満席でございます。もしよろしければ、お電話番号を頂ければ空き次第ご連絡できますが。
もうしわけございません。ただいままんせきでございます。もしよろしければ、おでんわばんごうをいただければあきしだいごれんらくできますが。
We apologize. We are fully booked at the moment. If you like, we could take your phone number and contact you when a seat becomes available.
Gesture & etiquette
Point vaguely at empty tables while asking.
Do not try to seat yourself. Do not insist on an empty table if told it's reserved.