Dear sir
I have understood your requirements about this project and so I'm able to develop it so that you're satisfied
I have developed many projects for 7+ years and so have the rich experience in this area.
Therefore I think we can start your task together.
If you hire me, I 'll do my best for you and so your project will be accomplished wonderfully.
Please believe me.
I value my credit and will be kept the promise with you.
Of course, the choice depends on your decision and I respect your opinion.
Hopefully, I hope you agree with my proposal and will accomplish it quickly and quality so that you're satisfied with it.
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Thanks very much.