To reach a live agent at Norwegian Cruise Line (NCL), call their main reservation/guest services line, often found on their "Contact Us" page (e.g., 1-888-510-8782for North America) and navigate the prompts to speak with a representative, or use their online forms/chat for digital assistance, though phone is best for immediate live talk. 
Here's how to get to a live agent: How Do I Contact a Real Live Agent at Norwegian Airlines