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.

I made an 8:00 RESERVATION.
The Big Bang Theory Season 1, Episode 17

Well, we have a 4:30 RESERVATION
at Applebee's.
The Big Bang Theory Season 9, Episode 14

I'll just call the restaurant, pretend
I'm Amy and check the RESERVATION.
The Big Bang Theory Season 9, Episode 8

An hour? What?
That's crazy, we have a RESERVATION.
The Big Bang Theory Season 9, Episode 15

if I find out that
you've left the RESERVATION,
Breaking Bad Season 5, Episode 15