Please analyze the tweet "Shame the cashback @mbna @AmexUK credit card comes to an end. I used to look forward to that end of year bonus. Sad really. #cashback" and classify its emotional content. Choose from the following emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If no emotions are detected, respond with "neutral or no emotion".