1. A system, comprising: at least one memory storing computer-executable instructions; and at least one processor configured to access the at least one memory and execute the computer-executable instructions to: determine an item associated with a transaction between a merchant and a user device using non-speech based user input transaction data associated with the transaction; determine a context associated with the transaction using at least a portion of the transaction data, the context comprising a set of one or more language model elements; determine, using the context, a first language model element of the set of one or more language model elements having a predefined association with the item, wherein the first language model element represents a command word or phrase; modify a language model by including the first language model element in the language model, resulting in a modified language model; determine, using the modified language model, that speech received by a user device includes the command word or phrase; and cause an operation corresponding to the command word or phrase to be initiated in connection with the item.