We extract the first word in a chat interaction, the bag-of-words representations (binary flags and tf-idf scores) of the chat interaction and features from sentiment lexica.
we extract flags indicating whether the turn has a positive, negative or neutral word in the list by Hamilton et al. (2016), the sentiment score of the chat interaction (summation of sentiment scores per token over number of tokens), and a flag indicating whether the interaction contains a negative word from the list by Hu and Liu (2004). 