Here is the plan you are going to pretend that you do not know my son...
Is this going to work?
Ophelia my dear what is wrong?
Hamlet has gone MAD!!!!
I must tell the King & Queen
Polonius is talking to one of his servants, Reynaldo. He is going to send Reynaldo to check on his son, Laertes in Paris. Reynaldo is going to talk to strnagers in Paris and pretend not to know Laertes to find out what he's doing.
Ophelia is now distraught, she tells her father that Hamlet is acting very strange and has cut all contact with him, just like he wanted. Polonius tells her that Hamlet is acting strange because he couldn't handle the rejection.
After Polonius talks with his daughter, Ophelia, he heads to Gertrude and Claudius to tell them why Hamlet is acting strange.