Of the two, on sounds more natural. I think that for sounds even better.
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sathishkumar1086Please block the seats at any date before June.Please block the seats on any date before June.book
Yoong Liat sathishkumar1086Please block the seats at any date before June.Please block the seats on any date before June.bookGood catch, Yoong Liat. I often concentrate so directly on the particular question that I miss other mistakes in the post.