Dear Sir / Madam,
I think I am the perfect person for this job! I have been working in a similar field (adult text chat through SMS messages) for the past 5 years or so, and could provide you with some really good feedback from my previous employers. I believe I am really good at the job, and would be more than happy if you’d decide to give me a chance to prove you so. I can guarantee you, you will be glad you have.
I would be more than happy to discuss lowering the hourly pay if needed. I can work all hours of the day, am a fast learner and a reliable worker. Would be willing to do a test job if it would help you decide, but I assure you, you don’t need to look further for a freelancer :-)
I hope you decide to give me a chance,
All the best,
Sneska