Yesterday I was denied boarding at the airport, which caused me to miss a hotel reservation on the other end. Actually, I called immediately after leaving the airport at 5 pm, assuming the cancellation policy was 6 pm, day of arrival. Turns out it was 4 pm, which I wouldn't have made anyway, as at 4 I was under the impression I'd be flying. The agent offered to transfer me to customer service to see if they'd waive the charge, but dropped the call and I hung up. I'm wondering now if it's worth it to send an email asking them to waive it?

I'm certainly not thinking I'm entitled to not be charged, but this is the first time this has ever happened, and I'm wondering whether to waste my breath and their goodwill or not.