We don't hassle. You send an email saying "Hey, I want to cancel!"
We respond with: "Bummer to hear, but happy to take care of that for you. Anything we could have done better?"
Then that usually sparks a longer conversation, but if we don't hear back within 24-48 hours, we just go ahead with the cancellation.
We're also very generous with refunds and certainly wouldn't keep someone's money just because we delayed the cancellation a day or two. That's just silly.