at (someone's) request
Due to having been asked (by someone). I'm only going to the dinner party at my mother's request. Molly has been invited at the bride's request.
at someone's request
due to someone's request; on being asked by someone. At his mother's request, Tom stopped playing the saxophone. At the request of the police officer, Bill pulled his car over to the side of the road.
at someone's request
On being asked to do something, as in At my request they'll move us to another room, or I'm speaking at his request. [1300s] Also see by request.