Translation of refine in German

I have the OK. They will make the changes and resend the homework tasks. I think that beginning of July would be a good date to start learning. What do you think? We should not wait too long.
After our system update, lessons will be saved for 30 minutes automatically, if you want to save them permanently, you need to press the 'save lesson' button. It than works the same basically.
Luckily the town was small and the hotel manager could call all taxi stations. They checked it through their radios and an hour later the driver was back with our bags. He did not want to be paid extra, but I insisted.