How to loop back to the beginning of the code on Python 3.7

Question

After I type 5 usernames, it stops itself. How can I prevent that.

username = ['admin','bill','kevin','mike','nick']

for user in username:
 name = input("Please enter a username: ")
 if name == 'admin':
    print("Hello "+ name.title() + " ,would you like to see a status report?")
 else:
  if name in username:
   print("Hello " + name.title() + " thank you for logging in!")
  else:
      if name not in username:
          print("Who are you " + name.title() + " ? ")

Answer 1

username = ['admin','bill','Kevin','mike','nick']
while True :

    name =input("Please enter a username: ")
    if name=='admin' :
        print("Hello "+ name + " ,would you like to see a status report?")
        break
    elif name in username :
        print("Hello " + name.title() + " thank you for logging in!")
        break
    else:
        print("Who are you " + name.title() + " ? ")