Dear Madam,
I am writing to inform you that due to my full time job it's not possible for me to continue my evening English Language classes in your academy.
Actually, I am working in a hotel as a cashier. So I had lot of responsibilities related to my profession like made a balance sheet, on time send the amount in bank as well as to check any money is left with some one while, all these duties I am not be able to consume my time for the evening courses.
I believe that gloaming assignments were very fruitful for me when I attend various meeting in my company and I had a potential to speak and clear my quries in front of my lodge members. However, I can't trust to any one that I divide my burden to some one.
I hope you can realize my position and circumstances.
Regards,
Yours Sincerely, 
Dear Madam,
I am writing to inform you that due to my full time job it's not possible for me to continue my evening English Language classes in your academy.
Actually, I am working in a hotel as a cashier.  
So
 I had lot of responsibilities related to my profession like made a balance sheet, on time  
send
 the amount in bank  
as well
 as to  
check
 any money is  
left
 with  
some
 one while, all these duties I am not be able to consume my time for the evening courses.
I believe that gloaming assignments were  
very
 fruitful for me when I attend various meeting in my  
company
 and I had a potential to speak and  
clear
 my quries in front of my lodge members.  
However
, I can't trust to any one that I divide my burden to  
some
 one.
I hope you can realize my position and circumstances.
Regards,
Yours  
Sincerely
,