Customer satisfaction is critical for any business. Good customer care is very important and can lead to increased sales and profit. Customers with any problems contact a customer support in hopes of getting a positive resolution of their problems.Unfortunately, after finishing their conversations with the support, customers tend not to leave any feedback. This fact creates a hard problem of evaluating the customer support effectiveness. In this work, we propose method, which should predict whether a customers problem was successfully solved during an online chat session or not.