Dear Sir or Madam, 
I am writing 
this
 letter to request you for allowing me some days off from work. I would be grateful if you can help me Linking Words
for
 Change preposition
with
this
 .
I want to take a long vacation from the office because my grandmother is severely ill and I have to go to India to see her soon . I am Linking Words
also
 planning to take the flight tickets for next week . I highly apologize for it but I have no other choice except to visit my home country . 
Actually,  I decided to spend at least two months with my family because I have a strong connection with my grandmother.  I do not want to come back  until my grandmother will  get well soon . So , it could be better if you allow me a break for two months. 
I know that you will be worried about the work that I do daily . Fortunately, my friend has advanced business skills and I firmly believe that he will give his best in our office . He is intelligent  and you should appoint him soon in our workplace. If you are interested ,I will send you all his personal details on your contact number .
I hope that you would give me a leave for two months Linking Words
as well as
 hire my close peer in my position . I am eagerly waiting for your response soon. 
Yours faithfully ,
Rahul Sharma.Linking Words