Let's start with a puzzle

There are four cars - a red one, a white one, a blue one and a green one. They belong to four friends - John, David, Amy and Mary and are parked next to each other in a street. Amy's car is to the right of the blue car, which is to the right of Mary's. John doesn't like white or blue cars. David's car is not next to John's car and is next to a red car. John and Mary are the only two who have letters in their name which are also in the colours of their car. Who drives which car?

Who will be the first one to solve the puzzle?