Do you see the “Get All Actors of Class” node and then the “Get” with 0 value? That means it will always get the “first chair” no matter what chair you approach. In UE4, “first chair” could be the first or the second chair. What you want is while querying all the chairs in the world, take note of their distance from your character and once you accounted all of them, choose the chair that is “closest” to your character.
EDIT: Below is an example:
