Hello. As you did not show the script to which this question refers, it is not possible that I can give you an answer with exactness. However, I will try to help you in the best possible way.
The tone of a text is the emotion that the text intends to convey to the reader, in this case, the author must use words that refer to that emotion or create an atmosphere that refers to that emotion. For example, if the tone of the text is a cheerful tone, the author should use words that add joy to signal the reader about the tone of the text.