# to greet somebody with their name you do like the following
def greet(name):
  print(f"Hello, {name} How do you do?")
  
greet("John Due")    # you will get Hello, John Due How do you do?

# if you wanna get the input from the user you can do that too!
name = input("Please enter your name: ")
greet(name)       # this takes the input from the user and then greets the user