A few sentences
A fictional dialog between two main characters in a book that I’m reading…Wasn’t sure what you meant by a “sojourn in the apothecary’s resident.”
The correction I chose, “residency,” is used to refer to the time that medical students spend embedded in hospitals, but may be incorrect depending on the context. Other words to consider are “internship” (especially if with a particular company), “rotation” (especially if the stay is part of an education which mandates multiple internships at a variety of), “apprenticeship” (especially if with an individual master of some trade). There are also the terms “practicum” and “co-op” that are used for some specific programs, and the words “stay” or “time,” which are more generic.
Also, note that English texts do not tend to use em-dashes to indicate a change in speaker like in French. Instead, the speech is surrounded in quotes and offset in paragraphs, often with the addition of something like “he said” or “Samson replied” at the end.
Some of the changes are optional, but made the speech sound more natural: removing “that,” changing “allowed” to “let.”