lift to Edi airport

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Hi there!
I need a lift to Edinburgh airport in the night between Sunday the 9th and Monday the 10th, between 3 and 4 a.m. ... I sent a request for a taxi to St Andrews direct but noticed too late that received no answer and now it's too late to ask again or to go to the Union because on Saturday it's closed... Is there anyone who wants to share a taxi or have other suggestion? Please help...
Thanks

Flavia