Verb conjugation of "erstechen" in German

Can we do it one day earlier? 30.April? I probably can't on the 04.05, but I will know just next week. Maybe we can do a phone lesson first and than the writing exercises. I do not feel ready yet.
I was a little confused because I recognized the voice and I had booked at Luisa's guest house. She explained me that she was sharing the phone with her neighbor and her neighbor was not honest.
After the bar we sailed back with the ferry to the other side, the side of the financial district, because there were some Halloween parties in the different bars at the Lan Kwai Fong street.