1. A computer-implemented method comprising: receiving, by a computer-implemented agent specific to a user device, a digital representation of speech encoding an utterance; determining, by the computer-implemented agent, that the utterance specifies a requirement to establish a communication with another computer-implemented agent represented by data, stored on the user device, that identifies a particular spoken style of speech for the other computer-implemented agent from among two or more different spoken styles of speech for a particular language; establishing, by the user device, a communication between the other computer-implemented agent and the user device; receiving, by the user device, identification of a response to the utterance from the other computer-implemented agent; determining, by the user device, the particular spoken style of speech for the other computer-implemented agent to use for presentation of the response; and presenting, by the user device, the response to the utterance received from the other computer-implemented agent according to the particular spoken style of speech.