Just a few suggested changes: A: Oh! Hi! Long time no see~ What have you been up to? B: Hello~ I'm fine~ How about you? Is your business going well? A: Pretty good~ Yes, We did well last month last month. Where is your husband? B: He's busy these days. He's going on a business trip tomorrow. A: Oh I see, Say hello to your husband! B: Okay~ See you later~ ................. I saw A today. She said say hello to you. I want to know if I can say like this. " She said say hello to you." You'd probably just say 'She said hello' or 'She asked me to say hello to you'

I would probably say she said *to* say hello to you

Hi, Candice! Thank you for your comment

They all look correct except for he is going to go on a business trip tomorrow.