The best restaurants serving American food in Preston Brent London

Quiet time with only 2 other tables with diners. Perfect as we had time constraints as off to a show. Sat waiting for about 10 minutes. 2 separate large parties came in and were sat either side of us. Both tables were seen to, one even having their drinks brought out. We were still sat waiting to be acknowledged. Got up to walk out and when said we were leaving as we were fed up of waiting, just got an abrupt “Ok” response.