The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

And open the back doors.
There's a CONVOY on the way.
Money Heist Season 3, Episode 2

but not to allow a CONVOY to enter.
Money Heist Season 3, Episode 2

Stop that CONVOY.
Money Heist Season 3, Episode 2

Sir, the CONVOY is approaching.
Money Heist Season 3, Episode 2

The real CONVOY is on its way.
Money Heist Season 3, Episode 2