By Michele Kambas ATHENS (Reuters) - Greece said on Monday its infrastructure was insufficient to cope with the waves of refugees flowing into the country in one of the worst humanitarian crises Europe has faced since the World War Two. International aid agencies have been scathing about Greece's response. "This is a reception country, and as such we are obliged to have infrastructure in place," Olga Gerovasili, spokeswoman for Greece's outgoing leftist Syriza government.