Help with simple AI

I'm not actually using ComputerCraft right now, but I'm doing it in the Lua live demo. I have some code that needs de-bugging. You can run it and see what errors you get in CC.

print ("Hi! I'm AlienAI Alpha 1.1! How was your day?")
print ("Good/Bad")
.yeild
io.read()
if "Good" then
   print ("Mine was great also!")
   end
if "Bad" then
   print ("Aww! I hope it gets better!")
   end
print ("Do you like music?")
print ("Yes/No")
.yield
if "Yes" then
   print ("Me too!")
   end
if "No" then
   print ("Hmm. Never heard of someone who doesn't like music...")
   end
print ("Oh well then. Goodbye!")

You're using ".yelid" in place of "read()". I honestly have no idea where you got that from, but no matter. Fixies away!

local input

print ("Hi! I'm AlienAI Alpha 1.1! How was your day?")
print ("Good/Bad")

input = read()

if input == "Good" then
   print ("Mine was great also!")
elseif input == "Bad" then
   print ("Aww! I hope it gets better!")
end

print ("Do you like music?")
print ("Yes/No")

input = read()

if input == "Yes" then
   print ("Me too!")
elseif input == "No" then
   print ("Hmm. Never heard of someone who doesn't like music...")
end

print ("Oh well then. Goodbye!")

One would store user input into a variable using read(), and then you would check that input against other strings and act accordingly.

I'm not very good with Lua, for now I'm just gonna focus on perfecting my password lock. I wanna make multiple accounts with a register account feature.