Trying to make AI travel (and face) a waypoint

im new to coding and unity, this is for a school assessment here is my present coding, please edit and tell me where i went wrong

var bison: Transform;

var waypoint1: Transform;

private var waypoint: Transform;

function Update(){ if (bison.position.x < waypoint.position.x) bison.position.x += 5; transform.LookAt(waypoint); if (bison.position.z < waypoint.position.z) bison.position.z += 5; if (bison.position.x > waypoint.position.x) bison.position.x += 5; transform.LookAt(waypoint); if (bison.position.z > waypoint.position.z) bison.position.z += 5; }