Ordering an Oat Milk Latte: what to say in English

Can I get a large iced oat milk latte, please? Actually, make that a medium.

Change your mind about drink size.

I'll have a medium drip coffee, black. No sugar, no cream.

Specify coffee type and no additions.

Could I get an extra shot of espresso in that? I really need the caffeine today.

Request more caffeine in your drink.

What size would you like? Tall, grande, or venti?

Ask customer for their drink size.

For here or to go? And would you like whipped cream on that?

Ask about dine-in and cream preference.

Actually, can you make that with almond milk instead? I'm lactose intolerant.

Request a milk substitute due to intolerance.

Can I also get a blueberry muffin? Is that warmed up or cold?

Add a muffin and ask about temperature.

Oh wait, can I switch to decaf? I forgot I can't have caffeine after 3.

Switch to decaf due to caffeine restriction.