Ellen, a cashier there, needs to re-take a training on how to serve customers PROFESSIONALLY. No eye contact, rude/arrogant tone of attitude, and jumped to conclusion (rung up our order in full price before we could present coupon). When we told her about the coupon offer, she (still not looking at us) told us to go across the building to validate the coupon. When we couldn't find the place she directed us to, she just repeated the same instruction. We changed our mind and went to another buffet.