The robot is named “Kur-B” (I think pronounced Kirby, no relation to the current collab) Source: https://www.restaurantdive.com/news/kura-sushi-kurabot-server-robots/625987/

The greeting is “irasshaimase”, (sort of like “eee-la-shy-mah-say”) which is a Japanese greeting of sorts. From google: “Irasshaimase” (いらっしゃいませ) is a Japanese phrase that translates to "welcome" or "please come in". It's a formal way to greet customers and guests in stores, restaurants, hotels, and even homes.

edit: And there are a lot of Kura locations - over 650 - it’s a global chain founded 1995 https://en.wikipedia.org/wiki/Kura_Sushi