Determine the emotional tone of the following 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". Use the provided emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. Respond with the emotions you identify or "neutral or no emotion".
anticipation, optimism, sadness, trust