In UML-Class Diagram what is the relation between name of class and name of its methods? In specifically are there any consistency between their names?

for example: 

I have three classes " Patient" , " Appointment" , and "Receptionist"

where the "Patient" should do this task: " request appointment",

And the "Receptionist" do this task: "make appointment"

Where should I put these tasks as class methods? Should I make it all inside one class "Appointment" ? Or put each method in the Class that has responsibility to do it ?