(your name)
123 street
Hyderabad, Telangana

27th September

R.K Sharma
234 street
Hyderabad, Telangana

Dear Mr Sharma,
     I would like to invite you to our school for giving a speech on the topic Future of English in India. On the date 2nd October, our school will be hosting an English Day celebration and I would like to ask you to join and also share your wisdom to all the young kids studying in our school
                The details are given below
                                                Time: 7 30 am to 12 30 am
                                                Date: 2nd October 2014
                                                Venue: (School name)
          I sincerely hope you can attend and deliver a beautiful speech.

Yours Sincerely
From : The Secretary of the English Literacy Society of (school's name)

To : Mr. R. K Sharma
 Dear Sir,             
          I want to invite you to our school to join in with our English Day celebrations. I would also like to ask you to give us a lecture on the future of English in India. Please send us your confirmation by this week.                                                                   
 Thank you so much