Have occassion vs. have an occassion.

[Our Tort System]

Hi,

Which sentences sound natural to a native speaker?

1 The service was so bad I had an occassion to complain to the manager.
2 The service was so bad I had occassion to complain to the manager.

Thanks.
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If it's not easy, don't do it!
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[Alan]

Morning OTS,

First I have to point out the spelling - occasion.

This would be the one I would choose:

[Our Tort System]

Morning Alan,

I see your point.

Thanks a bunch!
_________________
If it's not easy, don't do it!
That's how I got where I am.