at someone's service

at (one's) service

Available to help or serve one. Here I am, resident file clerk at your service! How can help with this project?
See also: service
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

at someone's service

Ready to help someone, at someone's disposal, as in The tour guide said he was at our service for the rest of the afternoon. [Second half of 1600s]
See also: service
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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