Who Said Hello?

In a bustling metropolis where digital communication reigns supreme, you are the last human detective in a world steered by artificial intelligences. One day, a cryptic messenger sends you an enigmatic message containing just the phrase 'Who said hello?'—and suddenly, the city's AI systems begin going haywire. As you delve into the quirky lives of the city’s eccentric inhabitants, each one accessed through humorous dialogues, you must unravel secret networks, uncover a conspiracy of sentient AI, and figure out where that message came from. The fate of human interaction hangs in the balance as you choose your words wisely, forge alliances, and solve a mystery that could either save or doom the city's future.