Give him a spontaneous compliment. For example if you notice his nice shoes try something like “I like your shoes. You have a good taste.” Then once you get his attention… conversation started. One of the best is to let him know you feel safe around him. “I feel so safe with you.” is fine if said in a genuine way.
Be friendly all of the time. Smile often and be helpful. Help him get to know you better by being affable and approachable.