Apologize

Dear Tina,

I am writing to apologize because last week you told me that this Friday everyone in class will go out for dinner and I said I would like very much to go, but I fear it will be impossible mission because my parents punished me for the disaster of my room. They told me that until I clean the room I couldn't go out with my friends, so hear is the problem.
Today is Wednesday, but I think that I can't clean my room before Friday because tonight I need to study in a friend house and I will stay there for two days. I hope you understand my situation, I need to pass these exams or I will have to repeat this course.
In summary, I hope that you really enjoy the dinner with the class. In Saturday I can probably clean my room and I will be free to go out.

Sorry,
Chus