My First German Conversation

I’m sitting at a cafe in the downtown area. I’ve just had my first conversation in German. Here it is:

(waitress approaches)

Me: Guten Tag.
Her: Hallo.
Me: Ein cappuccino, bitte.
Her: Ja.
Me: Danke.

(waitress leaves)

It’s 7 pm, and a bit late for an espresso drink. However, my german cannot grasp how to order a decaf double short latte. I’ll be up all night, so at least I’ll have the time to learn it.