At the School of Friendship Derpy is delivering mail but she bumps into the sign and drops the mail . Cozy Glow picks the mail up .
" Thank you for the mail delivery . Have a wonderful day ! "
In the School of Friendship she picks up an empty juice box and throws the box in the recycle and the straw in the trash . Then she notices a filly having trouble with a map .
" You're new here, right? " Cozy asks .The fily nods.
" I'm Cozy Glow , Proffesor Sparkle's friendship assistant . " Cozy Glow said " Welcome to our school ! Your first class is just down that hall . "
The filly walked away happily as Cozy headed towards the libary . She flew in and noticed Silverstream stumped on a crossword puzzle .
" A seven letter word for "teamwork". Have you tried "synergy" ? " Cozy asked her .
" That's it ! Thanks, Cozy ! " Silverstream said .
" What are friends for ? " Cozy replied .
Then Cozy Glow flew into Twilight's Office .
" Good morning,Proffesor Sparkle " Cozy said as she handed Twilight the mail .
" The mail's here already ! What time is it ? I'm late for my class's trip to Cloudsdale " Twilight panicked .
" Don't worry " Cozy reassured her "I asked Proffesor Rainbow Dash to cover for you "
" And she said yes ? " Twilight asked her .
" Uh-huh . I told her how busy you are and how much her loyalty meant to you . I also color coded your teaching Schedule by friendship element and catalouged all the magical artifacts in the school . " Cozy said " I hope that's okay . "
"Okay ? Cozy, that is amazing ! You're like my right hoof mare ! I don't know what I'd do without you . "
" It's like you taught me . Helping others is what friendship is all about . "
" Exactly. And hopefully my class is learning that on their field trip right now "
" I heard they might do some sightseeing first " Cozy Glow said .
" Proffesor Sparkle ? " Cozy asked Twilight .
" Yes , Cozy ? " Twilight replied .
" While I was cataloging the artifacts I thought I saw Chancellor Neighsay for a moment " Cozy admitted .
" I'm sure you were just imagining things , Cozy " Twilight reassured her " If Chancellor Neighsay was in my school , I would know about it . "
Meanwhile , In Cloudsdale
" Ta-da ! The Pegasus Weather Factory ! " Rainbow Dash said " Every drop of rain or flake of snow comes from there . "
The students awed.
" I know , right ? " Rainbow said " Hey ! The cool stuff's over here ! "
"Wow ! I've never stood on a cloud before . " Ocellus exclaimed .
" You can't normally. But for our trip I cast a spell that lets us walk like pegasi " Starlight explianed .
" Hey Yona ! Come check out this view ! " Gallus said " Unless you're too scared . "
" Yona not scared " Yona said . All of a sudden Yona fell through the cloud .
" Now Yona scared ! "
The others looked shocked as the other non pegasi fell through the clouds .
" Come on " Rainbow Dash said " We gotta catch 'em "
The non pegasi screamed but they all got caught . Yona started screaming but she got caught by Ocellus and Gallus .
"Gotcha ! " Gallus said .
" It's okay,Yona. " Ocellus said " You like flying ,remember ? "
" Flying, not falling " Yolla replies as Ocellus and Gallus put her on the ground with a "thud". Yona starts kissing the floor .
" I don't understand " Starlight said " It's like my spell stopped working . That's … never happened before . "
You did switch between past tense and present tense a few times, your grammar could use some work, I find the quotes hard to read when they’re seperated from the word like you did, and “she flied” should be, “she flew”, In all, I think you should find an editor, or edit yourself,
But the story it self seems alright, I’ll see where this goes
Compliments to you on sharing your first story. It's definitely off to a good start as you start to alter the events of the Season 8 finale.
The flow of the story is good. The only thing that breaks it up are spelling errors. Fortunately these are not bad enough to take away from what you are telling here in your story.
First stories tend to have spelling errors along with times where the tense changes from present to past. Fortunately, as you continue to write, you will get better with this and grow into your talent as a writer.