(formal) Used as a polite introduction on first meeting another person.
Available for assisting you or for you to use.
Source: en.wiktionary.orgI am nothing - a will-o'-the-wisp at your service - a clod of vivified dust whom its progenitors christened Amos Midwinter. I have no possession but my name, and no calling but that of philosopher. Naked I came from the earth, and naked I will return to it. John Buchan
Dear Mr. President: It appears proper that I should bring to your notice the fact that the record shows that I shall attain the age of 64 years on November 23rd next- one month from today. I am as always at your service. Most sincerely yours, Ernest J. King Admiral, U.S. Navy. Ernest King
My heart is ever at your service. William Shakespeare
Stylist Ben Dover at your service. Source: Internet
Wings, nachos, pigs in blankets at your service. Source: Internet
Tesla wants to be at your service. Source: Internet