I ask the user for a review at the end of the conversation using a basicCard. It is not possible on a device with no screen or web browser so essentially I can only ask for reviews when my action is used on an android or iOS device. So, is it possible to send a notification from the user's non screen device to his phone?
You can use multi-surface conversations, which will allow you to send a notification from a speaker to a phone to continue the conversation with the same session.