I have used a sentence today like below but not sure I used if so correctly here;
Additionally, we could make your booking via e-mail if you prefer to proceed that way. Please let us know if so.
I would just move this around slightly:
Or, you could re-word to get the same meaning:
You used it correctly.
There is a slight addition I would implement to make it clearer:
That way, there can be no misunderstanding.
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