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.

Context: 
Utterance: 'hello'
No

Context: 'Yes, I may need more water.  I am on a diet and I don't really cook either!  Hopefully we can work something out here.' 'That sounds great. I probably need to go on a diet, but I like my food to much. LOL' 'Well, I am pre-diabetic, so I had to do it for my health. I love food, too...especially sugar!  🙂🙂'
Utterance: 'Oh, that does change things a lot. Diabetes is a hard disease to have to deal with. So you want more firewood than water? And less food than water?'
Yes

Context: 'Water if very important to me as well. I'm on a medication where I get dehydrated very quickly and I need to make sure that I'm properly hydrated at all times. ' 'Well that is going to be a problem then because I have a medical condition too. How can we meet in the middle? I get 2 water, 2 food and no firewood?' 'I really need that water. I'm going camping in the desert where firewood will be vital for me as well. How about I take 2 water, 2 firewood and you get 1 water, 1 firewood and all the extra food?'
Utterance: 'That works. Deal🙂'

No