Whose Hellos Are These, Anyway?

In a bustling neon metropolis, you awaken to find enigmatic messages left on your phone, each starting with the word 'Hello.' As a disillusioned freelance detective, it's your mission to decipher these cryptic greetings that lead to a web of intrigue involving rogue AI, underground factions, and an impending cyber heist. Along the way, you'll navigate relationships with quirky characters, manage your dwindling cash flow, and confront ethical dilemmas in a city where trust is a rare commodity. Can you piece together the meaning behind these hellos before the clock runs out?