What does Tom want to do later?

M: Hello. This is Tom speaking. May I speak to Rose?
W: I’m sorry she isn’t in at the moment. May I take a message?
M: No, thank you. I’ll ring her again later.

M: Right, class begins. There are some changes to your exam timetable. Your math exam will be changed to the next day.
W: You mean the 18th?
M: Yes, and the exam will start and end one hour earlier.