9. One or more non-transitory computer storage media storing computer-readable instructions that, when executed, instruct one or more processors to perform operations comprising: analyzing a previous conversation with a first virtual assistant to identify a topic that has been discussed in the previous conversation more than a predetermined number of times; identifying a second virtual assistant that is not currently associated with an account of a user and that is configured to perform one or more tasks that are relevant to the topic that has been discussed in the previous conversation more than the predetermined number of times; providing, to a device associated with the user, a suggestion to add the second virtual assistant to a group of virtual assistants that are associated with the account of the user, the group of virtual assistants being configured with different personas; receiving user input indicating a selection of the second virtual assistant to be added to the group of virtual assistants; and based at least in part on the user input, adding the second virtual assistant to the group of virtual assistants by associating the second virtual assistant with the account of the user.
14. The one or more non-transitory computer storage media of claim 9 , wherein the operations further comprise: analyzing preference information describing a preference of the user; wherein the identifying the second virtual assistant is based at least in part on the analysis of the preference information.