Implementations can receive user input during a dialog session between a user and an automated assistant at a client device of the user and via an automated assistant platform, and in response to determining that the user input requires a user interaction with a non-assistant platform: store a state of the dialog session between the user and the automated assistant, transmit a request to initiate the user interaction to the non-assistant platform that causes an additional client device of the user to render a prompt for completing the user interaction, and receive a token associated with the user interaction from the non-assistant platform. In response to receiving the token associated with the user interaction, implementations can cause the dialog session between the user and the automated assistant to be resumed based on the stored state of the dialog session and based on the token associated with the user interaction.