Asking for Help Finding Something You Lost

You dropped or misplaced something and ask nearby people if they've seen it.

You
¡Disculpe! Se me perdió mi cartera. ¿La ha visto por aquí?
dees-KOOL-peh! seh meh pehr-DYOH mee kar-TEH-rah. lah ah BEES-toh pohr ah-KEE?
Excuse me! I lost my wallet. Have you seen it around here?
"Se me perdió" literally means "it got lost on me" — a common way to express losing something without blaming yourself directly.
Local
¿Cómo es? ¿De qué color?
KOH-moh ehs? deh keh koh-LOHR?
What does it look like? What color is it?
You
Es negra, pequeña. También se me perdió mi teléfono. Estoy muy preocupado.
ehs NEH-grah, peh-KEH-nyah. tahm-BYEHN seh meh pehr-DYOH mee teh-LEH-foh-noh. ehs-TOY mooy preh-oh-koo-PAH-doh
It's black, small. I also lost my phone. I'm very worried.
Use "preocupado" if you're male, "preocupada" if you're female.
Local
Espere, creo que vi algo debajo de esa banca. ¡Mire, ahí está!
ehs-PEH-reh, KREH-oh keh bee AHL-goh deh-BAH-hoh deh EH-sah BAHN-kah. MEE-reh, ah-EE ehs-TAH!
Wait, I think I saw something under that bench. Look, there it is!
You
¡Sí, es mía! Muchísimas gracias, es usted muy amable.
SEE, ehs MEE-ah! moo-CHEE-see-mahs GRAH-syahs, ehs oos-TEHD mooy ah-MAH-bleh
Yes, it's mine! Thank you so much, you are very kind.
"Muchísimas gracias" is a superlative — stronger than "muchas gracias" — perfect for when someone really saved the day.