Flight enters US before my visa is valid

I have gotten a non-immigrant visa that starts on August 15. I thought it would start on August 1, and got a flight from Europe to the US for August 4.
What can I do in this situation? I think rebooking the flight will be difficult. Is Visa Waiver an option for the intermediate time?
Best Answer
The question is based on a wrong premise: my visa is in fact valid from an earlier date.
I was fooled by the "annotation field" in the visa, which states the dates of my program. The person at the embassy I spoke to said that one may enter up to 30 days before and exit up to 30 days after the program.
If someone has the same question but with a correct premise, I'd be happy to open this question again!
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