What happens if you don't find Someone to cover your shift?

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Hey, This Month I have to go on a School trip to spain.

I've already informed my boss and my manager about it, and they told me to find Someone to cover my shift.

And In my job contract it says that my School is always 1st priority.

I work at a Big supermarket, I work 2 hours monday and friday. I need Someone to cover my shift...

My departement have a FB page were we Can Exchange our shifts and stuff like that..

I've asked twice if anyone could cover my shift on the FB page... Still no responses..

I also wrote and asked a lot of the other Workers, none of Them were able to cover my shifts..

What Will happen if I Can find anyone to cover my shift?


Thank you.