at the moment , so far

[Ju]

May invited Bo to attend a Christmas party. Bo's mum replied as follow:
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I need to comfirm with Bo first. As far as I know, Bo's been fully booked before and after Christmas at the moment.
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Can I replace at the moment by so far? Any other suggestion?
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ju

 

[kiwi man]

NOT A TEACHER!

If you use so far, it seems okay to me, but it sounds repetitive because you have already used "as far as I know"

Therefore, I would stick with "at the moment." If you try to be fancy, you can use "until further notice."