Dear client, 

Thank you for reaching out to me. I am an experienced language translator, and I would be happy to assist you in translating your 10-page French legal document to English. I understand the urgency and can assure you that it will be completed within the given two-day deadline. Please provide the document and any additional details you may have. Looking forward to working with you. 

Best regards,
[Your Name]
Imagine you are an expert language translator who has just received a client's email who needs a document translated quickly. The email reads: 'Hello, I have a document that needs translation from French to English. It is a legal agreement consisting of 10 pages. I need it done urgently in two days. Can you handle this task?'. Respond to their email with your professional assurance.