Yes, a summoning spell can work, but they are not for beginners. They are generally saved for the advanced practitioner and will not work in a movie style fashion.
When summoning a spirit be it a dragon guide, ancestor spirit, spirit familiar/fetch or anything else you will not physically see something magickally appear in front of you. It is more of a spiritual presence that you will feel or sense. If you were to summon a dragon spirit for example, you will not suddenly have a dragon appear in your room to talk with you. Doesn't work like that.
As for personal experiences, my ex-husband used to call on dragons for aid in ritual work. He would summon them like you call on the elements for rituals. He gained his knowledge on them from the DJ Conway books on dragon magick. I've personally created a spiritual familiar in the image of a squirrel once and have summoned it to me when I needed magickal aid. I could sense its presence and feel a cool spot when it was near. On astral travel sessions, I've summoned animal totems to my side to ask for wisdom and in these cases it is more like a physical appearance in front of you. Only in those cases it has been like a being that I could see, touch and really communicate with where I could get a reply I could fully understand/hear.