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: @pandaflo22 We are sadden by this because we always strive to bring the best service to our customer. We will always be here for you. CM
This tweet contains emotions: 
anticipation, optimism, sadness, trust