Formal letter Dear Sir/Madam, I am writing in regard to the start of working as a software engineer in your company on November 15. I regret to inform you that I can embark only on November 17. Let me explain my situation in more detail. My current boss asked me to finish an urgent international project. Only I collaborated with that company and know all the details of the agreement. I understand how crucial is starting to work at the right time and, therefore, I worry about your attitude to this situation. But nevertheless, I am aware of the good relations to job and colleagues even if they are former too. I would like to offer my sincere apologies for any inconvenience which I had caused for your company. Please, allow me to suggest to work during the first weekend. I believe that I will do all the work what I must to do in time. I hope that this change will not cause you too much. I look forward to hearing from you. Yours faithfully, Victoria