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: After spending £450 @Debenhams I was offered a £5 voucher. I asked if I could spend it at weekend? Was told 'no valid today only' #unhappy
This tweet contains emotions: 
anger, disgust, sadness