The asset can be downloaded from here:
https://assetstore.unity.com/packages/templates/packs/low-poly-game-kit-pro-121871

I explain how to use the prefabs to setup a simple quest to find and collect gems.

The quest is given to the player from a quest giver character in a conversation, which is also a prefab.

In this video you can see how to setup a conversation in the UTalk database:

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