We use say and tell in different ways in reported speech. Say focuses on the words someone said and tell focuses more on the content or message of what someone said. I also noticed that usually we use Say + Something & Tell + Someone
1.What did the doctor say about your back pain?
2.Did you tell mom that you were coming home for Christmas?
3.I have to tell you something very important.
4.The hotel receptionist said that the supermarket closes at 8pm.
5.I saw Alessia yesterday, but she didn’t say anything about her exam.
6.Tell me a little bit about yourself.
7.Could you please tell the teacher that I will be a few minutes late?
8.What should I say if they ask me for a deposit?
9.Don’t tell me too many things at once because I will get confused.
10.President Trump says stupid things almost every day.