In this case,"will have been" becomes "would have been"
The boy said" They will have been waiting for me"
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The boy said They would have been waiting for me
The girl said" I will have been an air hostess by 2020"
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The girl said I would have been an air hostess by 2020
The man said" I will have been getting old in 10 years"
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The man said I would have been getting old in 10 years
She said" I will have been married in 3 years time"
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She said I would have been married in 3 years time