Set phrases for opening paragraph
I am writing to you in connection with..
I am writing with regard to / in regard to / with reference to.
I am writing to ask if you could informal me about..
I was interested in your advertisement in..
I would appreciate some further information about..
Referring to your advertisement published in.
I am writing to give you some information about.
I am writing in reply to your letter.
In reply to your letter concerning..
With reference to your letter of.
Set phrases for closing paragraph
I would bee very grateful if you would / could reply as soon as possible.
Thanking you for your time assistance.
I would like to thank you in advance.
I look forward to your reply at your earliest convenience.
I look forward to hearing from you.
I hope this information will be of some help to you.
I would be happy to supply you with any further information..
If you need further information, do not hesitate to contact me.