For public transit in my city they have an official website where you can type in where you are and where you want to go and it plan it all for you. Can choose from arrive asap to picking a time when you want to depart or a time you want to arrive. This has been operational since 2002.
More recently Google Maps has the same functionality and it will work in many cities across the world.
I think their broader point is that it's becoming common to reach for an AI chat to solve problems that should take a few seconds of thinking to solve. Notably this kind of thing is not a search problem, since you presumably already know the schedules for both busses and just need to come up with a reasonable allowance for schedules not lining up properly.
More recently Google Maps has the same functionality and it will work in many cities across the world.