Nowadays, when the competition is very high, networking can be key to your job offer, because it helps you to maximize your chances of getting interviews at the firms you are targeting.
Actually, you need to build a funnel of 10 or even 20 potential contacts to get some results.
First of all, find common ground with people you're talking with. You can ask some general questions about their work/company/responsibilities/hobbies.
Ask the right questions that are easy to answer, which might produce an interesting conversation.
Another advice is to offer them something instead of asking for something. (information, your services, etc).