Thanks for your appreciate advice.
We prepare the below cover letter for our application. Would you please read it and let us have your view point on it?
"Dear Great Console in Tehran,
My sister and I apply for two weeks tourist visa. However, we know is not enough time to see all of your beautiful country, taste delicious cuisines, visit all historical places and enjoy amazing landscapes in different parts of Spain. We hope to see most of these in our short time. (Please see our trip plan in attached No.1)
As you can see in attachment documents, we have been running a small family business that we both are shareholders there, and because of our busy schedule we only can have limited time for travelling and try to enjoy it as much as we can. In last August, We asked your esteemed colleagues for urgent visa but at that moment there were not enough time to issue it, and now if it would be possible we want to ask for visa for the Nourouz Holiday that is the largest holiday in Iran. (Refer to att. No.2 - email history)
As fund of our trip, we saved money each months in cash. And due to instability of exchange rate of money in Iran, we had to change it to US Dollars and Euros. (Refer to att. No.3 – exchange statement for this year)
We also provide one of company's bank account for you to check. Not to mention that you can find our salary bank account in attachment files, too.
We will be grateful, if it would be possible for us to see your country on our vacation. I hope that our tip's plan will be clear and we'll have chance to see Spain. However, please do not hesitate to contact us, if you have any consideration."