Chris: Should we go to the concert tomorrow?
Anna: Is anybody else going?
Chris: I think Lia and Isabel 
Anna: nice! I haven't seen them for a long time
Chris: so should we go?
Anna: yes, let's do it
Chris: great! I'll write you more tomorrow morning
Anna: ok!
Chris and Anna will go to the concert tomorrow. Lia and Isabel will probably be there too.