I am a Swiss citizen, 20 years old and travelling through the U.S with a rental car.

Driving through the yellowstone national park in wyoming I made a really bad and stupid decision. There were 3 cars in front of me and I decided to pass them because there was absolutely no traffic on the other lane. Unfortunately, the first car was a U.S park ranger which pulled me over because I passed him way too fast.
The speed limit on the road was 45mph and I passed him with 78mph, so 33mph over the limit! The ranger wrote me a ticket which says that I have to appear in court in september... He also told me to call a number of an attorney of the US government who will tell me what the further steps will be.

I never got a speed fine in the U.S or in Switzerland before and I really regret what happened. I am willing to pay the fine but are not able to appear in the court because I will return to Switzerland in 2 weeks.

Has anyone got an idea what will happen to me? Any recommendations what to tell the attorney of the government on the phone?

Thanks for your help in advance! :)