I accidentally booked the wrong date on a flight that costs ~$120 - booked about 2 weeks ago. I'm prepared to eat the cost, just rebook the correct date (one day earlier), and hope for cancellation/schedule change. The flight was purchased from and marketed by Delta, but operated by WestJet.

The flight is 1 month from today. I should be silver by 5/29 and hopefully gold right around 1 month from now. But right now I have no status.

Is it possible that a sympathetic agent would waive the change fee? Should I try phone or twitter/facebook? Booking code and price is the same for the flight one day earlier. Do you think I should wait until after I reach silver? The risk being that the needed flight is no longer available or significantly more expensive. I assume being silver won't help at all, but not too familiar with Delta's "rule breaking" for elites. Thanks.