If you don't want to use sir or madam what can you use?

If you prefer not to use "sir" or "madam," you can address someone by their name, using their first or last name as appropriate. Alternatively, you can use a neutral term like "person" or "guest" if the context allows. In professional settings, titles like "manager," "team member," or "colleague" can also be effective. Using "hello" or "greetings" can be a friendly, inclusive option as well.