Knowledge: Dolphins are sucessfully kept as pet in Dubai Mall's aquarium, but they have not been successful in keeping species of ray fish in artifical water bodies.

Conversation:
I once swam with manta rays. They are beautiful creatures.
Aw, that's nice. They're found in subtropical and tropical waters. Is that where you swam with them?
Yes. Can I have them as pet in aquarium?

Response: No, Dubai mall has not been successful in keeping ray fish in atrificial water bodies.