at (one's) disposal
Ready and available to help or serve one. If you need anything during your stay, our staff is at your disposal. Welcome to the neighborhood! I'm at your disposal if you need help with anything.
at your/somebody’s disˈposal
available for use as you prefer/somebody prefers: He will have a car at his disposal for the whole month.Well, I’m at your disposal (= I am ready to help you in any way I can).