Help in Choose Dialogue Notifier Please

I'm trying to make a code for school where when you click a button it notifies if the action will proceed (which is to text a message to a number). However, I only need 2 buttons, "YES" and "NO." How can I change the outcome of each button without using cancelable since this gives me 3 buttons? I'm not sure what I am doing wrong since I am still new to this.

Like so

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Thank you!!