I have never understood when a photographer or a model starts a conversation about a shoot, it gets very detailed, and even possibly booked, and then nothing. I call it the drop off. You wonder if their phone died. You wonder what happened to them. And then wonder if you should even make a response to nothing.
Communication is soo important in the modeling and even just the business world. Take the time and let people know what is going on. They will appreciate the time that you have taken to reach out. Whether you have an assignment in the works or not, you will work to make that rapport possible.
Take the time and reach out to the ones that you are wanting to work with. Take the time and reach out to the ones that you have worked with and see what they are up to. You never know what can come your way.