Revert "Just trying out a :phone: call.. "

This reverts commit d8c5c288f257be482f820b565a86fdd606be297a.
Merge branch 'ggp-sprint2-endtoend' of github.com:guidance-guarantee-programme/prototypes into ggp-sprint2-endtoend
Format slot date and time.
Output number we are calling from.
Keep chosen time in the session.
Merge branch 'ggp-sprint2-endtoend' of github.com:guidance-guarantee-programme/prototypes into ggp-sprint2-endtoend