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: 
Utterance: 'I'm thinking I'l get 2 firewood, and 2 water and 1 food. I'm not sure what you need, but we can figure it out. '

Ex Output:
Yes


Ex Input:
Context: 'I am not able to get around as much to gather the food. It could require a lot of walking and I might find nothing. What if I took 2 food, 1 water, and 2 firewood, would that be good for you?' 'How about I take 3 water and 2 firewood and you take the rest?' 'I think I can live with that.'
Utterance: 'Great we have a deal then?'

Ex Output:
No


Ex Input:
Context: 'Hi. Why do you need so many food packages?' 'Well, I have two teenage boys who will be with me.  In normal circumstances they go through a lot of food.  While camping, hiking and kayaking I know we will need plenty to keep their energy level high to do everything.🙂' 'Well I will definitely need 2 packages of food and 2 of firewood for survival.'
Utterance: 'I am definitely ok with giving you two of the firewood!!  Why do you need 2 packages of food?'

Ex Output:

Yes