I am taking leave since may 1st till may 15th, and dr suggested me take more leave from 16th to 24. I sent my first sick leave letter already, but now I need to write another letter to extend my sick leave. Here is my writing. Please help to check my mistake.

(company)

(address)

11th May, 2011

Dear xxxx,

Request for extended sick leave

I am writing to request an extension of sick leave from 16th May, 2011 to 24th May, 2011 inclusive due to suffering from ______.

I would be highly obliged if you would grant me leave for those days. Please accept any inconvenience caused.

Attached herewith a sick leave certificate from Dr. xxxx.

Yours sincerely,

Ms. xxxx

Encl.
Re: Request for extended sick leave

Dear xx,

I am writing to request an extension of my current sick leave from 16th May, 2011 up to and inclucing 24th May, 2011. (A note of your specific illness should be in the doctor's affadavit)
I would appreciate it if you would grant me leave for those days. I regret any inconvenience caused.
Attached is an affadavit from my attending physician, Dr. xx.
I am writing to request an extension of annual leave from 16th May, 2011 to 24th May, 2011 inclusive due to suffering from ______.

I would be highly obliged if you would grant me leave for those days. Please accept any inconvenience caused.

Attached herewith a sick leave certificate from Dr. xxxx.

Yours sincerely,

Ms. xxxx

Encl.