I'm relatively new to this game and new to these forums, so please move this topic if necessary.
Currently, I only build on the tutorial map in the freebuild mode to learn the game mechanics.
I have now got three individual quest from potential customers asking me to build lines from various places in the town to some other places.
To the best of my knowledge, this is exactly what I did. But the tasks don't complete.
The passengers would have to use different lines and change between them, including a little walk, but the connection in principle is possible and should be convenient.
I'm not sure how often passengers are willing to change, but in at least one occasion, both targets lie within the radius of my metro stations, which in turn directly connects them.
Rather surprisingly, the quests sometimes popped up, right before or after I was about to create a line in that region anyways.
I have uploaded the saved game to my webspace so you can inspect my mistakes directly rather to have to rely on my descriptions.
Thank you for the help in advance!