Allegro,

Did you even read the promotion dude? It says that the tickets are on sale from June 8-28 while the travel dates must be between July1-November 30.

Alterego,

You're right but that is because the promotional offers must not be available in the dates you picked. You might wanna try searching on different dates. Also, the seats and the offers are based on availability. This basically means that the sooner the seats get filled, the lower your chances of getting promotional fares.