Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: Flight 815 crashed on The Lost Island 2004 #lost @JoshuaJThurston
This tweet contains emotions: 
sadness