Task: Question Answering
Input (English): We first expand upon previous work and generic dialogue act taxonomies, developing a fine-grained set of dialogue acts for customer service, and conducting a systematic user study to identify these acts in a dataset of 800 conversations from four Twitter customer service accounts (i.e. four different companies in the telecommunication, electronics, and insurance industries). 
 Question: Which Twitter customer service industries are investigated?
Output (English):  four different companies in the telecommunication, electronics, and insurance industries