Нужно составить деалог из следующих предложений : 1)why not! see you tomorrow morning then. 2)have you ever been to the planetarium? 3)i don't know yet. 4)what are you going to do on sunday morning? 5)no, i've never been there. 6) len's go then. it's worth seeing.

(1) -Hey. What are you going to do on Sunday morning?

(2) - Hi, I don't know yet.

(1) -  Have you ever been to the planetarium?

(2) - No, I've never been there. 

(1) - Len's go then. It's worth seeing.

(2) - Why not! See you tomorrow morning then.

P.s. Hey и Hi (приветствия), если не нужны, можешь убрать.