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: @WestHamUtd poor service tonight to find season ticket holders in the seats we purchased online. Forced to move further away #unhappy
This tweet contains emotions: 
anger, sadness