Is this grammatically correct? if no please correct it.?

Question

Dear Sir,

The conference line is available any day from 9:30am to 11:30am, to participate please dial the below number. Regarding the request for the change of timing I will discuss it to Mr. Hussain, Khalid A when his contact no. is available or once he reply to my email.

Answer 1

Dear [Enter Name],

    The conference phone line is available everyday from 9:30am to 11:30am. To participate please dial the number located below. In regards to the requested change of time, I will discuss it with Mr. Hussain, Khalid A. when I receive his contact information. Thank you and have a wonderful day.



Sincerely,

[Signature]

[Your Name]

Answer 2

I support what the mk told.

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Answer 3

"...to participate please dial the number below.
Regarding the request for the change of timing I will discuss it with Mr. Hussain Khalid A when his contact number is available or once he responds to my email...."