Most of the times what you ask for, will not be given at once. People don’t have an obligation to give you what you want. Or even listen to what you’re asking for.
But it is your responsibility to keep asking until they pay attention. That’s what I call “keep knocking the door”. Just keep trying, until they can’t resist you.
If you want it badly, go after it like anything. Don’t lose hope quick. Keep trying, you will get it.