" is the normal expression. " isn't quite so polite-sounding, but also it just doesn't feel as idiomatic in that particular situation.
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GPY "I am / I'm wondering ..." isn't quite so polite-sounding, but also it just doesn't feel as idiomatic in that particular situation.I also feel that it is less confident, as if I'm not sure about whether or not it will happen, or if I should even ask.