New Programmer, How do you use If and Elif and Else statements? Its giving me NameError: name 'No' is not defined

answer = input('Hi! Would you like to say something? (No or Yes)')

if answer == No or no:

print('Okay then, have a good day!')

elif answer == Yes or yes:

answertwo = input('What would you like to say?')

print(answertwo, 'Hmmmmmm, Intresting.')

if answer == No or no: NameError: name 'No' is not defined