Everything has a price, including lunch.
We often feel we are God's blessed child, and the whole world will serve, and help us. This can't be further from the truth. Most people specially the ones not so near are transactional. If you are getting something from someone right now, be prepared to pay a price later.
Only 1 thing can destroy this transactional approach. It's called love. Where love exists, the barter stops. Because love is a pure giver.
Otherwise, be prepared to pay a price for your lunch. There is no such thing as a free lunch.