Validate my startup idea [I will not promote]

Finding parking is a nightmare in busy cities. What if you could reserve a spot in advance instead of endlessly circling around? Here’s how it works: 🚗 Bob knows he’ll leave his parking spot in 5 minutes and notifies it through the app. 🅿️ Alice is looking for parking in that area and reserves Bob’s spot. 👥 Alice drives there, waits for Bob to leave, and takes the spot. 💰 Alice pays Bob x tokens, which she previously bought in the app. 🔄 Bob converts and withdraws the tokens into EUR/USD or any other currency. Would you use an app like this? Any flaws you see in the concept?