title: Detect the speaker of Google Home or Amazon's Alexa
body: <p>I would like to detect who is interacting with my agent.</p>
  
  <p>For example I read that Alexa should be able to detect different users. The Google Home advertisement also let me think that it should detect who is talking. So how can I see who is talking?</p>
  
  <p>In slack it seems to be easier since it is well known who is writing. However I cannot see who I get the current user.</p>