Work unfairly refused my holiday request.. what can I do?

I requested 1 day off next week to spend with my gf as it is her birthday - I requested this a month ago when no one else at my work had requested it. I come into work today to find out that my manager had 'forgotten' to take my request slip to the office and authorised someone else's request on that... show more I requested 1 day off next week to spend with my gf as it is her birthday - I requested this a month ago when no one else at my work had requested it. I come into work today to find out that my manager had 'forgotten' to take my request slip to the office and authorised someone else's request on that day instead whom had requested the day off after me! He said there's nothing he can do and is denying me my holiday still even though it's not my fault, I followed the work guidelines and he can see on the sheet the day that i requested it and he even remembered me handing the request to him.

what can i do
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