The word alistarás is the future form of alistar in the second person singular. There are other translations for this conjugation.
See the full alistar conjugation

alistar

Te alistarás en la Marina conmigo.
You are joining me in the Navy.
¿Así que te alistarás?
So you're signing up then?
Y el lunes tú y yo iremos a Nashville y te alistarás en el ejército.
And on Monday, you and I are driving to Nashville and you're joining the army, boy.
Una vez que salgas nave, te encontrarás poco haber relajado y lo alistarás para hacer frente a otro día en el trabajo.
Once you depart ship, you will find yourself a little more relaxed and ready to face another day at work.
Solo dije eso para que no te alistaras en esta misión.
I only said that to keep you from signing on to this mission.
No quería te alistaras para nosotras.
I didn't want you getting ready for us.
Nunca quise que te alistaras.
I never wanted you to join up... never.
Te dije que te alistaras.
I told you to get ready!
Sé que te dije que estaba feliz de que te alistaras en las Fuerzas Aéreas, pero la verdad es que no estoy feliz en absoluto.
I know I told you that I was happy you joined the Air Force, but the truth is, I'm not happy at all.
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