of service to someone, be
Help someone, as in How can I be of service to you? This idiom uses service in the sense of “supplying someone's needs.” [c. 1700]
Words nearby of service to someone, be
of necessity,
of note,
of old,
of one's life,
of one's own accord,
of service to someone, be,
of sorts,
of the devil,
of the essence,
of the first water,
of the kind