Dear Ali, I just have received your letter, in which asking me to join you in London on my vacations. I am very pleased to receive such offer and would love to spend some time with you just like before, when we were living in Pakistan. Unfortunately, as you already know I am studying ACCA and attempting exams every six months. This time my exams are starting right after my winter holidays and I am afraid that I will not get any time for revision after my vacations. In addition to this problem, as you know that London is very cold during the winter and I am allergic to cold weather. Lets plan out meetup in summer vacations in four months. We can visit beaches and do lots of activities, which are cannot be performed during winters. Thank you for considering my request. Your faithfully, Abdul
Dear Ali, I  
just
 have received your letter, in which asking me to  
join
 you in London on my vacations. I am  
very
  pleased
 to receive such offer and would  
love
 to spend  
some
 time with you  
just
 like  
before
, when we were living in Pakistan. Unfortunately, as you already know I am studying  
ACCA
 and attempting exams every six months. This time my exams are starting right after my winter  
holidays and
 I am afraid that I will not  
get
 any time for revision after my vacations.  
In addition
 to this problem, as you know that London is  
very
  cold
 during the  
winter and
 I am allergic to  
cold
 weather.  
Lets
 plan out meetup in summer vacations in four months. We can visit beaches and do lots of activities, which are cannot  
be performed
 during winters. Thank you for considering my request.  
Your
  faithfully
,  
Abdul