Meaning of 'shame'

[Ganesh]

In that case I'll try the roast beef
We haven't got any left
Oh that's a shame
Perhaps I could have the pork
in this context what is the meaning of 'shame'

[Milanya]

The expression "it's a shame" (not the word 'shame' by itself) in this context means that the person is sorry that there is no roast beef left.
It is a shame means that it is unfortunate or disappointing: It's a shame that he didn't go to college. Synonyns are "it is too bad," "it is a pity," "unfortunately," etc.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.