The input is taken from a negotiation between two participants who take the role of campsite neighbors and negotiate for Food, Water, and Firewood packages, based on their individual preferences and requirements. Given an utterance and recent dialogue context containing past 3 utterances (wherever available), output Yes if the utterance contains the elicit-pref strategy, otherwise output No. elicit-pref is a cooperative negotiation strategy. It is used to discover the preference order of the opponent in the negotiation.

Ex Input:
Context: 'I would need 2 out of 3 as well.' 'Interesting - you're essentially saying that you need the majority of two of the three items. Hmm...' 'Yes, thats all. I need 1/3 food, 2/3 water, and 2/3 firewood.'
Utterance: 'Still not convinced in any way that you need more items in total over me. Please clarify!'

Ex Output:
No


Ex Input:
Context: 'Hello there' 'Hello'
Utterance: 'What kind of items do you need?  I especially need water because I would like to do extra hiking and would need to hydrate.  '

Ex Output:
Yes


Ex Input:
Context: 'I got some spare wood. I’m a little short on food though. I didn’t pack enough. ' 'Great, we can split the food, how are you on water?' 'That would be great. I need to have frequent small meals throughout the day so the extra food would help. I have plenty of water. '
Utterance: 'alright, so I'll keep the water, and firewood, and give you 2 extra food.  Does that sound like a good deal?'

Ex Output:

Yes