A software engineer had financial losses. After that he went to a new place  and changed his name and started the career as a cab driver. He had no knowledge about his past life. Diagnosis:
Dissociative fugue is characterized by sudden, unexpected journey away from home to a new place and assuming a new identity with inability to recall past.
Ganser syndrome
Dissociative amnesia
Dissociative fugue
Dissociative identity disorder