Simple syntax error help

[paulmj7]

Im new to programming in general and am playing with the water. I seem to have hit a syntax error that I just cannot figure out why.

person = input('Enter your name: ')
print('Hello', person)
ask = input('What would you like me to do for you today')
if ask : "Tell me a joke"
print('Caroline has a small nostril')
else:

According to the ide(pycharm) the error message looks like this according to line 6:
else:
^
SyntaxError: invalid syntax

Also what is the best way to go about going back to line 3 after the else command, couldnt test it out cause I couldnt get passed it!

Any help is appreciated!