It's not wrong, you can use both. However, it does in some contexts change the meaning slightly. Your context means that you checked to see if tickets were available.
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R WilliamsIt's not wrong, you can use both.
Thanks, I did think both usages correct, but for some reason getting was marked as wrong on a test given on another language forum.
Very subtle and quite a difficult concept to learn.
It is subtle, that's true.