Lesson 3.04 slides tell students to prompt user; they haven't learned that yet

[KatherinePapcun]

I think this issue was already reported on the TEALs discourse forums. It looks like the worksheet was updated, but the slides were not.

On slide 52 of the Unit 3 slides, it instructs the students to prompt the user for destinations. The students have not yet learned how to use console input, so the assignment should instruct them to pre-select 3 locations and hard code them in.