Phillip meets Marco's parents to determine Marco's needs, and assess whether he is eligible for travel training.
Due to Marco's intellectual disability, Phillip cannot rely on Marco's judgement of his capability to independently use public transport. The best way for Phillip to learn about Marco's abilities is to talk to Marco's parents.
If, after talking to Marco's parents, Phillip doesn't feel that Marco would be eligible for training, he will make alternative recommendations to Marco's parents.