Buddhism after death

From what I understand the aggregates aren't self but now when a person dies and the material aggregates of his body dissolve then what remains who gets reincarnated ?.If there is no soul then what carries the **information** of this person to go to another life for example what defines that this is the person and not someone else do we have a serial number :) ?. When the new material aggregates of the new body are born then they are different from the ones of the person who died .What defines that **THIS** person is in **THAT** body?.