I know your room may be booked by then, but I cannot tell you now if I will come.
--- Is the tense correct in the part in bold?
Newguest I know your room may be booked by then , but I cannot tell you now if I will come. --- Is the tense correct in the part in bold? Yes.
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NewguestI know your room may be booked by then, but I cannot tell you now if I will come.
--- Is the tense correct in the part in bold?
Yes. That's fine.
CJ