Do not accept a vague promise when the problem needs a specific arrangement.

Vague reassurance is often given sincerely and solves nothing. Leave it with me, I will look into it: these end the conversation without creating any obligation, and the person who needed the outcome walks away with a feeling instead of a plan. Weeks later nothing has changed and raising it again feels like nagging.

When something matters, ask for the who and the when before the conversation closes. Say it warmly and without apology. If the specifics cannot be given, that is useful information too, and it is better to have it now.