public boolean changeName(String newName) {
		if (responder.validateName(newName)) {
			String oldName = this.name;
			this.name = newName;
			message = oldName+" changed his/her name to "+newName+".";
			return true;
		} else {
			synchronized(responder) {
				out.println("That name is already taken.");
				return false;
			}
		}
	}