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.

Input: Consider Input: Context: 'Hi! I like to hike so I really need more water. Could I take 2 packages of water and 1 of food and 2 of firewood?'
Utterance: 'I am ok with the water, i just would like one water and one food, but i would appreciate two firewoods, i get cold at night  '

Output: No


Input: Consider Input: Context: 'I still don't think that is too fair though, since you would be getting 6/9 of the extra items and I would only be getting 3... I'm not an avid camper so I need extra amenities to make sure I survive haha. I am flexible on the water though - maybe we can compromise there. I am fine with you having all of the wood. Maybe we could give you 3 firewood, 1 food, and 1 water?' 'That sounds very fair to me. Thank you for being understanding. 🙂' 'Definitely! I am glad we could come to an agreement. Do you like to camp a lot? Or hike?'
Utterance: 'I love to camp! Especially when there is enough firewood! It is a great (and inexpensive) activity for me I get a lot of enjoyment out of. Hopefully you will become an avid camper after this trip!'

Output: No


Input: Consider Input: Context: 'Would it be possible to get an extra water also?  How do you feel about the firewood?  I wish we could split everything evenly.🙂' 'Me too. Firewood is the most important thing to me. We will be somewhere cold and we could use the extra warmth.' 'True.  How about I get 2 food, 2 water and 1 firewood. And that will leave you with 2 firewood, 1 water, and 1 food? '
Utterance: 'What do you need the extra water for?'


Output: Yes