You could also just call for him either in your head or out loud and just say what you need to say or ask. You'll know if he's there with you if you can feel warm, relaxed, and safe. If you really want to make sure he's there with you, you can ask him to give you a sign. An example could be if you all of a sudden start to feel tingles perhaps on your hands or around your whole body. It might be difficult the first time and the signs might not be clear but he is definitely there with you and listening to you! It just takes time and practice. Eventually your connection with him will get stronger and you'll be able to see and feel the signs he's giving you. I hope I was able to some what help!