Chicken Bakes

This is a serious question & I would appreciate a response. Why, when we are in Costco in San Diego or Las Vegas, can we always get a side of Caesar dressing when my husband orders a chicken bake? Yet, when we order the same in Fargo, ND, the employees refuse to give it to us "per their kitchen manager." Several years ago there, we did speak with the store manager & she agreed it shouldn't be a problem. We would even pay extra if we had to - which we don't in CA or NV. Thank you.