I'm reading a conversation between a customer and an shop assistant. It goes like this:

C: Excuse me. Where do I pay for these?
A: Over at the cash register.

I can't figure why he said that.

Or these examples:

'Bill lives over on the other side of town.'
'She was standing over by the window.'

How is 'over' contributing to the meaning in all these sentences?! I feel if I drop 'over', nothing changes, is that so?