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I want to ask permission from my manager to go to railway station to leave my parents. can you help me to ask permission in better way ?
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Could I leave for couple of hours to accompany my parents to the railway station?
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I'd appreciate if I could leave (work) for couple of hours to accompany my parents to the railway station.
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Marius HancuCould I leave for couple of hours to accompany my parents to the railway station?
or
I'd appreciate if I could leave (work) for couple of hours to accompany my parents to the railway station.
Could I leave for couple of hours to accompany my parents to the railway station? (Shouldn't it be "... a couple of hours ..."?

I'd appreciate if I could leave (work) for couple of hours to accompany my parents to the railway station. (Shouldn't it be "I'd appreciate it if ...'?)
You're right.