Need help to setup Ai to assist with dementia

Hi all
Firstly …i apologise if this is the wrong place to ask…
I have dementia and am hoping that the use of Ai will be beneficial. eg… remembering things, asking my usual repetitive questions and just chatting with someone ( even non-human) that won’t be offended when I get confused or pissed off etc.
I use an iPhone 15, downloaded ChatGPT, and signed up for the ChatGPT Plus plan.
Is there a setup that I can use that I don’t have to type and just use something like Siri or Alexa assistant and just talk etc?
I am willing to pay for assistance …as I don’t have a programming background etc…
Any help would be greatly appreciated

ps. this is what im battling with…
In the videos online… you see the guy simply talking to his phone and getting a response … how do I set that up?
I can press the speech button…then press the button for Ai to recognise and convert to text. then after I submit… i get a spoken answer back.
What am I missing…as I just don’t see what to do!
I have paid for the PGT Plus version. downloaded the app on my phone…