Reactive dog advice

Well we had a bad experience today, im upset and Tucker knows it. A met a person who had a lab. Denver met him before and hit it off playing. This lab is 6 or 7 month old super close to Tuckers age. So his name is Charlie. We went on a walk, i was walking Denver someone else was walking Tucker(before this i took him on a 10 minute walk to get him started). Charlie walked around the corner and gently met Denver, meanwhile Tucker started barking, lunging and trying to bite Charlie. Then he started trying to do it to a kid near the park. He was walked to the other side of the street until we got home... We told him no tried pulling him away, redirecting him. It didnt work... We are going to call up the trainer we use, but i cant do reactive dogs. I cant we go camping and are always traveling, hiking, walking, outside in the summer. I just dont know what to do? What do orhers do with reactive dogs. At this point im lost at what to do. We have never once had a reactive dog.