Translation of certify 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.
Sunday is fine. Please let us talk tomorrow to arrange a schedule of that day. I will call you tomorrow, but in any case, here is my number again. We could do it also on Monday next week, if it fits everybody.
I can highly recommend to visit there. After only three hours we had to leave and drive to the international airport. We ate lunch and boarded the aircraft which took us to Bangkok within three hours.