Work Order

Generate a professional work order document with the following details:

Client Name: {{client_name}}
Work Description: {{work_description}}
Estimated Cost: {{estimated_cost}}
{{start_line}}
{{completion_line}}
{{assigned_line}}

Create a complete, professional work order that includes:
1. A clear header with work order number (auto-generate one) and date
2. Client information section
3. Detailed description of the work to be performed
4. Estimated cost clearly stated
5. Start date and completion date (if provided)
6. Assigned technician/contractor (if provided)
7. Terms and conditions section
8. Approval/signature lines for client and contractor

Format the document clearly with proper sections and professional business language.
Return only the work order document text, nothing else.