'for the moment I replacement Katarzyna' (to jest zle, wystarczy...a replacement for Katarzyna).
Yesterday 'i' (dlaczego piszesz to mala litera? tak nisko o sobie myslisz?) booked (brak przedimka) hotel for you.
I need TO know details of your arrival and departure (which airport and WHAT time).
'If i' (nie, niepotr, wystarczy ONCE) know 'it' (tutaj dalabym THAT), I will book a taxi for you.