Task: Go to the SBB Mobile app and search for the train from Bern to Berlin Hbf on August 17.
Steps:
open the SBB mobile app.
Click on the Train icon in the Bottom left corner.
Click on the tab Plan a journey  at the bottom.
click on the tab time table on the left side
Click on the first column to enter the starting location.
Type Bern in the search box.
click on the tab second tab
Type Berlin Hbf in the ending location.
click on the second tab.
click on the second tab.
click  on the date icon on the left side.
Select the date August,17
Click on the Accept tab at the bottom.
Click on the Accept tab at the bottom.