Yes, it is easier to meet the right persons, but you need to use the right methodology. You can request the reception person to have a one minute meet with the HR person, while delivering your CV to them.

Also while looking for their location over telephone, you can request the receptionist to transfer the call to their HR department, the success may be 50% but that is not too bad.

If HR guy is busy, you can request to meet with the GM or any other person from the management, who are mostly able to help.