Your English appears to be at a very high level. There were some words you mispronounced, but if you want, I can record them in our next session and send it to you to listen to again and again. What we discussed about, I can not remember if it is called group think exactly, but it should work. One other idea for you is to discuss job satisfaction and performance. People who are satisfied, at least to one book I own, are more likely to have regular attendance. Again, mold this to the specifics of your company, keeping in mind your boss, the boss from the states, and potential others. If you would like, one other thing we can discuss is business vocabulary. So our topics are informal (warm) professional business communication, regional slang, and topics of your interest within business. Since this is an ongoing problem, stress that it needs action, since this is a simple clash of cultures, (my opinion), rather than full job dissatisfaction. I would not know to be sure. I wish you luck!