About the pizza part:
The telephone guide was, probably, the first thing you interact with in the game. This leads to a situation in which you don't remember it enough to associate it with Pizza delivery, but if you say something like "If I could order it somehow..." it would be totally clear.
What if... when the player interacts with the telephone guide the first time, lists some of the phones in it? Like... "A telephone guide, hm... plumber... food... mom.... but I don't even have a telephone."
Some people actually got it right away, it's a bit of a set up and pay off. I do think it could be fixed by adding that part to the dialog :)
I don't think that would help much unless you add "pizza delivery service" to it but I like the fix above more.