Task: Analyze the tweet's sentiment and assign it to either 'neutral or no emotion' or one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: @redBus_in #unhappy with #redbus CC, when I talked with them before a week still they didn't initiate the refund of the transaction.
This tweet contains emotions: 
anger, sadness