Question

Cenceling a dialogue the invitation

Answer 1

E.g. of invitation dialogue
A:Hi, i'm gonna be shoping ing market,let you go with me!

SO d' canceling sentences are
B:1.Sorry i'm still working
   2.oh i have to do my duty first
   3.i fell tired now

Answer 2

Ria : Hello, Rie! Would you like to join me to come to Nina's party tonight?
Rie : Hmm...I'm sorry. I must do my homework tonight.