根据短文内容，用适当的单词或句子补全对话。
A: You look unhappy. ___________________?
B: I argued with my friend.
A: Would you mind talking about it to me?
B: __________________. It all started when I lost his camera. You know, his mom got it for him as     his 15^th birthday gift.
A: Oh, I see. ___________________________?
B: A new camera? It’s too expensive. I don't have enough money.
A: Maybe you can go to the lost and found to look for it
B: __________________. I nearly forgot. I’ll go there at once.
A: Good luck!
B: .___________________.
A: You’re welcome.