Wait until you get to experience Assistant then go back to Siri. It makes people want to cut that m9 coprocessor out and throw it in a crusher.
My new iPhone 7+ Hey Siri takes 5-6 seconds to initialize then you have to speak so 20 seconds later you MIGHT be telling her something. Sigh, I'm in a world of hurt thanks to my Note 7.
Apple did something funky to Siri a couple of years ago that completely throws off interaction queues and and speaking flow. The experience is completely wrecked and I feel like Siri is getting dumber and less useful every iteration.