I have tried to use the migration assistant but it doesn't seem to work. Has anyone encountered this and found a way to migrate ?
Yes many people use Migration assistant and it works.
Without you posting the exact problem and how you are using it and how the systems are connected together no one can help you figure out the problems you are having.
A detailed, illustrated guide was written by the late James Pond, and at this writing, his excellent support site is still available:
Setting-up a new Mac from an old one, its backups, or a PC
Retrieving data ...