Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: @Uber very disappointing that support has not responded to my email!! #bad #uber #service
This tweet contains emotions: 
anger, disgust, pessimism, sadness