to serve him, to serve her, to serve you (formal)
Dígame usted en qué puedo servirle.
Tell me how I can help you.
Para servirle.
At your service.
Siempre es un placer servirle.
It is always a pleasure to serve you.
Príncipe Guido, para servirle, princesa.
Prince Guido, at your service, Princess.
— La vida es bella (1997)
Y nos trajo aquí para servirle a él.
And he brought us here to serve him.