Sentencs arrangement. 1. Looking forward to the opportunity of doing business with you soon. 2. We refer to your letter of 15 August regarding the supply of black silk. Thank you very much for your order. 3. We are consequently fully committed at the moment and are unable to make you the offer as requested. 4. Demand for the above products, however, has been heavy since last season. 5. We assure you, however, that we shall contact you as soon as fresh supplies become available.