Dinosaurs changed to birds and other reptiles over time.
Even if birds and other reptiles evolved from dinosaurs, that would still leave the question of what happened to the dinosaurs descendants that were still dinosaurs. Evolution does not mean that individual dinosaurs actually turned into birds or other reptiles.
Obviously my ancestors changed in appearance several times since its origin in early earth. At some point the offspring started to look less and less like they looked 1000 or more generations ago. Offspring are individuals that represent the group they are identified by.
True, but that does not necessarily mean that there are not present day offspring around that still look like your early ancestors rather than like you.