this is about business letter...
can you give an example of Inquiry and reply... thank you.. :)
http://www.google.com/search?q=inquiry+and+reply+business+letter&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA
http://owl.english.purdue.edu/owl/resource/548/01/
You may find some help in these websites.