1. A method for employing a network device to provide response message completion, wherein the network device enables actions to be performed, comprising: determining a response completion model (RCM) that includes at least a generic response language model (LM), a stimulus model, and a mixing parameter; receiving a stimulus message (SM) from a stimulus message sender; if an incomplete response message includes at least one preceding word, determining at least one candidate next word for the incomplete response message based on the RCM, the SM, and the at least one preceding word; selecting at least one word from the at least one determined candidate next word; including the selected at least one word within the incomplete response message; and generating a complete response message that is based at least on the incomplete response message that includes the selected at least one word, wherein the complete response message is provided to the stimulus message sender.