why accept other type of train/class?

Question

I am booking tickets and one of the reason I picked your site is that it seems to be able to guarantee me getting tickets and have it delivered. Why is there a question in the check out that asks me whether i'd accept other train or class? Are you hinting that it is possible for you to not have the tickets I want or you can't deliver it? I am booking like more than a month in advance....

TCG Operator · Answer

It is possible that we could not get the tickets you booked, sometimes, the tickets are not available once they are released to public.

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Why "accept other type of train/class"?