...
Young Ellie: Dad, do you think there's people on other planets?
Ted Arroway: I don't know, Sparks. But I guess I'd say if it is just us... seems like an awful waste of space.
...
Young Ellie: [on HAM Radio] CQ, CQ, this is W9GFO. Is anybody out there?
...
Alien: You're an interesting species. An interesting mix. You're capable of such beautiful dreams, and such horrible nightmares. You feel so lost, so cut off, so alone, only you're not. See, in all our searching, the only thing we've found that makes the emptiness bearable, is each other.
...
Ellie Arroway: [to a group of children] I'll tell you one thing about the universe, though. The universe is a pretty big place. It's bigger than anything anyone has ever dreamed of before. So if it's just us... seems like an awful waste of space. Right?
...