at your/somebody's disposal

at (one's) disposal

Ready and available to help or serve someone. 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.
See also: disposal

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).
See also: disposal