My while loop isn't working for input validation [duplicate]

This question already has an answer here:

• Asking the user for input until they give a valid response 18 answers
• Why does `a == b or c or d` always evaluate to True? 2 answers

end_program = False
while end_program == False:
    user_choice = input('\nWould you like to play a game?\n Please pick yes or no\n').lower()
    if user_choice != 'yes' or 'no':
        print('You didn\'t pick yes or no...try again please\n')
        end_program = False
    else:
        end_program = True