Business Letter Writing practice--replying a letter

The pic below is the recieved email and requirement from a book. And it also requests that the letter to reply should be diplomatic and encouraging to the customer.

MY REPLY:

Dear Mr Ferquson

Thank you for your letter asking our proposal for the service requirement from your letter.

Here please allow me to give you more details about the main business of our company. We are an office cleaning company and alos do garden maintence. In this field we do a professional job and have excellent references which I would be happy to supply. So for the part of your requirement, which are cleaning and plant care, we can offer you excelllent services. The other requirement from your letter, we have to work in partnership with another company specailising in maintence and security in order to meet you needs.

I quite understand if you would like to find one contractor which can do all the tasks. Also if you are willing to consider other options, we will provider you a neat solution working in partnership with another company. I hope our proffessional and excellent services will serve you.

I look forward to hearing from you.

Best wishes

Frank