msg = ''
user = {
  'realkokeny':{
  'isBanned': False,
  'isVerified': True,
  'age':21
},
  'vetekbence':{
  'isBanned': True,
  'isVerified': True,
  'age':14
  }
}

login = input('Please Log In: ')
login.lower()

if login in user.keys():
  isLoggedIn = True
  if user.get(login).get('isBanned'):
    print('You are banned!')
  elif not user.get(login).get('isVerified'):
    print('You are NOT verified!')
  elif user.get(login).get('age') < 18:
    print('You are under age!')
  else:
    msg = input('What\'s in your mind?\n')
else:
  print('Wrong username!')

if msg:
  print(f'{login}: {msg}')