Change in Reservation time?

[DisneylandSam]

Hello! I'm new to the forums! So I recently snagged a Blue Bayou dinner reservation for my day at Disneyland, but am no longer able to make it to that specific time as I need to leave earlier than planned. I know you can check for other times in the app to make a change, but of course there are none available since the reservations for this place are so sought after.

I'm wondering if there's any chance of talking to someone earlier in the day and seeing if they can squeeze me in? In my mind already having a reservation would increase the odds of them squeezing me in (also I am going alone).

I'd really appreciate any tips if more experienced Disneyland goers have any wisdom to share!