That's both the beauty and the hazard of hiring (and being hired) over the internet. You can easily just pull out at any time with no consequences. I've had a virtual assistant disappear on me for weeks without a word. I've also fired virtual assistants with a single month's notice. It's so much easier than dealing with local labour laws but you both face the risk of never hearing from the other and you have absolutely no (or very little) recourse.