Task: Determine the dominant emotion in the tweet and classify it as either 'neutral or no emotion' or one of the eleven provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: @antoboyle I so wish you could someday come to Spain with the play, I can't believe I'm not going to see it #sad
This tweet contains emotions: 
sadness