For example when you are in a restaurant with someone, you sit down and the waiter come to and ask for the orders. After the first order it is a common thing to link them together like this : És önnek mit hozhatok ? = And what can i get for you?
Or it is often used in slogens like We are for you= Önért vagyunk. Nekünk ön az első= For us you are the first. or you can use it like this Mit tehetek önért? =What can i do for you?
Oh i didn't understand it in your initial question but i see it now I think it is just something you have to learn there no explanation for it (but keep that in mind that i am not a linguist) But i think the reason behind this is that you want to be less personal. For example if you talk to someone who you want to be formal with you just can't use Hogy vagy? and Hogy érzed magad? Because it is very informal and it is assume that you are more likely friends or at least equal partners (in the term of status, age, etc.) in that conversation.
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