Task: "I need to travel to Washington DC for work after I visit New york the following week, so I should check the Trainline app for bus schedules from New York to Washington DC  for September 20th."
Steps:
open the trainline app
Click on the from section
Enter a origin New York 
Click on the first result
Click on the destination section
Click on the destination section
Enter a destination as  Washington DC
Click on the first result 
Click on the first result 
Click on the find times and prices button 
Click on the find times and prices button