It's considerate to drive a relative somewhere.
Dave is just relaxing and doing nothing at home when his sister Suzy asks him to drive her to a doctor's appointment.
Dave wants to respond to Suzy's request.
Dave tells Suzy that he'd be glad to drop her off since he's got nothing to do anyway.
Dave tells Suzy he's relaxing right now and doesn't feel like getting up, so she should take the bus.
Suzy is happy she won't have to ride the bus and is glad she has such a good brother.
Suzy is annoyed by Dave's laziness and is stressed that now she might not make it on time.