A system and method include reception, from a remote system, of a trained natural language processing model implementing a dialog flow-based application, reception of input parameters from an operator while not in communication with the remote system, input of the input parameters to the model to initiate a transaction, storing of transaction data associated with the transaction in a local memory, determination that the mobile device is in communication with the remote system, transmission, in response to the determination, of the stored transaction data to the remote system, and reception, from the remote system, of an updated trained model based on the transmitted transaction data.