We evaluate the performance of our SGNNs on Dialogue Act classification, because (1) it is an important step towards dialog interpretation and conversational analysis aiming to understand the intent of the speaker at every utterance of the conversation and (2) deep learning methods reached state-of-the-art <cite>(Lee and Dernoncourt, 2016</cite>; Khanpour et al., 2016; Tran et al., 2017; Ortega and Vu, 2017) .