Definition: Given a negotiation between two participants, answer 'Yes' if both participants agree to the deal, otherwise answer 'No'.
Input: THEM: gimme hat and book YOU: umm, if you ask nicely you can have them THEM: gimme hat and book now YOU: no deal THEM: agreed YOU: if you were nice they wouldve been all yours THEM: no nice YOU: cool THEM: yes YOU: yep.
Output:
No