Interrupting someone considerately

Perdona la molestia

per-DOH-nah lah moh-LES-tee-ah — Sorry to bother you

"Perdona la molestia, ¿tienes un momento?"
Sorry to bother you, do you have a moment?

A step more formal than a plain "oye" — reach for this when you're interrupting someone who's clearly busy, not just starting a casual chat.

"How I open an email when I need something from someone who's clearly busy. Works every time."— Graciela