Beware of the voice assistant

A few months ago, I had recieved my silly neighbors at home. I was so bored for hours until they left. Some hours later, I texted my sister, saying: "Hi Mary, finally our goofy neighbors have gone; it was so boring... See you tonight".
But they actually were taking my sister from work to home in their car. So my sister's phone rang indicating that a message had come. Its voice assistant activated and asked her: "You have a message from Enrique; do you want it to be read?".
As the phone was at the bottom of my sister's bag and she wasn't able to catch it quickly, she just answered "Yes" and the assistant started to read the message...
Both of my neighbors heard the message and my sister was so ashamed...
Then, another message came and my neighbors said her "Come on Mary, say yes!" but this time, my sister answered "No!".
What a shame!