How to pass values to a method with @classmethod

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Python

I'm new to python, I've been teaching myself for about a month, am now learning about @classmethod.
I see it as private in languages like Java am not sure though. I want to understand what it does. I decided to create this small program

class Hello:
	def __init__(self, name):
	self.name = name

	@classmethod
	def say_hello(self):
	print("Hello {}".format(self.name))

	def reply(self):
	return self.say_hello()


Justine = Hello("Justine") 
Justine.reply()

What I have tried:

Since methods with @classmethod have

cls

as first parameter
I changed self to cls still am getting an error (AttributeError: type object 'Hello' has no attribute 'name'