Dear Sir/Madam,
I am a student who is registered in your 
course
 for Use synonyms
this
 semester and I am writing Linking Words
this
 letter to inform you that I might not be able to continue the Linking Words
course
 due to a change that has been made in my job. 
Please let me provide brief personal information; I work as a project manager in a technology company. On the one hand, I took your Use synonyms
course
 because my job involves some coding knowledge. Use synonyms
On the other hand
, I am always interested in learning new skills and I thought it would be useful in life. 
Unfortunately, it was all right until recently I was assigned by the corporation to move to a different branch in another city. Linking Words
Therefore
, Linking Words
although
 I am keen to learn in your evening Linking Words
course
, it is not possible to make it happen now. 
Now, I am wondering if it would be possible for me to rejoin a cohort Use synonyms
course
  Use synonyms
next
 July when I come back. it would be greatly appreciated if you could let me know as soon as possible
Yours faithfully,
JasonLinking Words