I installed iOS 27 yesterday and first thing went to try new Siri. My settings for Siri responses was set to 'Auto' and it wasn't responding with a voice. So the first chat with a new Siri went like this (tried first example):

   Me:   - Hey, what's the sunrise time tomorrow?
   Siri: - (showing me popup with sunrise info)
   Me:   - Can you respond with a voice?
   Siri: - To whom?
   Me: - To me..
   Siri: - Here are the contacts I found in your contact list.
   Me: - No, I mean can you give me the answer using voice?
   Siri: - Here are some results I found on the web...