This is a regular verb. It follows the conjugation pattern of the verb falar.
This verb is more formal. In everyday speech, voltar is more commonly used.
Present:
A Ana retorna ao escritório depois do almoço.
Ana returns to the office after lunch.
Preterite:
O Miguel retornou para casa tarde da noite.
O Miguel retornou a casa tarde da noite.
Miguel returned home late at night.
Conditional:
A Clara retornaria àquele lugar um dia.
Clara would return to that place one day.