15. One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by at least one processor, configure the at least one processor to perform operations comprising: determining 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; determining 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; determining, using the context, a first language model element of the set of one or more language model elements having a predetermined association with the item, wherein the first language model element represents a command word or phrase; modifying a language model by including the first language model element in the language model, resulting in a modified language model; recognizing, using the modified language model, presence of the command word or phrase in input speech data; and causing an operation corresponding to the command word or phrase to be initiated in connection with the item.
15. One or more non-transitory computer-readable media storing computer-executable instructions that, when executed by at least one processor, configure the at least one processor to perform operations comprising: determining 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; determining 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; determining, using the context, a first language model element of the set of one or more language model elements having a predetermined association with the item, wherein the first language model element represents a command word or phrase; modifying a language model by including the first language model element in the language model, resulting in a modified language model; recognizing, using the modified language model, presence of the command word or phrase in input speech data; and causing an operation corresponding to the command word or phrase to be initiated in connection with the item. 17. The computer-readable media of claim 15 , the operations further comprising: identifying the user; and selecting the language model from one or more candidate language models associated with the user.