Can I get more towels?

You can use this phrase with staff or hosts. Start with Excuse me to be extra polite. You can add the number of towels you need. For example, Can I get two more towels? works perfectly. It is a standard 'request' structure in English.

Use this at a hotel front desk. Use it when calling housekeeping from your room phone. It is also great at the local swimming pool or gym. If you are staying at a friend's house, it is a safe way to ask. It works whenever you are the guest and they are the host.

Do not use this in a restaurant. Unless you spilled a whole gallon of water, it sounds strange. In a store, use Can I buy instead of Can I get. Avoid using it with a very demanding tone. You want to sound like a guest, not a boss. Don't use it if you are the one hosting the party!

In Western hotels, 'more' is usually expected and free. Asking for extra items is a normal part of the service industry. Americans especially love having many fluffy towels. It is not considered rude or greedy to ask. Most hotels actually prefer you ask rather than using one towel for everything. It shows you value cleanliness and comfort.

You might hear Could I have some extra towels? for more formality. Friends might say Do you have any spare towels? at home. If you are in a rush, I need more towels is okay but less polite. May I have is the most formal version. Any chance of more towels? is a very casual, British-style variation.