at someone's service

prepositional phrase2

1. •
   Fully available to help or to be of use to someone, or some organisation.

   • John will be at our service for the duration of the visit.
2. •
   (formal) By way of introduction on first meeting another person.

   • James Bond. At your service.

prepositional phrase2

1. •
   Available for assisting you or for you to use.

   • "But senors," added he, smiling, "if you think a residence there so desirable, my apartments in the Alhambra are at your service." — 1832
2. •
   (formal) Used as a polite introduction on first meeting another person.

   • 'My name, Madame, is Hercule Poirot - at your service.' — 1934