I was given a tour of the store by the shop assistant
The shop assistant showed me around the store
The shop assistant gave me a tour of the store
Shop assistant = 店員
案内する = to show around, give a tour
I was given a tour of the store by the shop assistant = 私はお店を店員さんに案内してもらった。
The shop assistant showed me around the store = 店員さんはお店を案内してくれた。
どちらも大丈夫です!