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: 'My kids will enjoy that as well. I'm hoping I can pack several extra things of firewood. If I could get 3 more packages I would feel better about having enough firewood to have campfires during the evening and to cook on. ' 'ok I completely understand. I am more than happy to offer you 3 firewood in exchange for 3 food. If you are ok with splitting 2 water for me and 1 for you that works well. My kids need food and water for their medications.' 'Hmm I will consider it. I'm worried about not having enough food for my kids. They seem to be on a growing spurt and get very frustrated quickly when they are hungry. I would be will to negotiate it I can get 3 firewood, 1 food, and 1 water. '
Utterance: 'Food is very important to me probably as much as firewood is to you. If we can stick with the 3 food, 0 firewood and 2 water that would be great. '

Ex Output:
No


Ex Input:
Context: 'I can trade more food but I need a bit more water.  ' 'I do need the water as well, I can  trade more firewood.' 'No I want need at least two packages of water.  I can give you two packages of food and all my firewood.'
Utterance: 'Sorr I can give you 1 water only or I would not have enough for myself. '

Ex Output:
No


Ex Input:
Context: 'Hello. I'm looking forward to striking a deal with you that makes both of us happy!' 'Sure I am waiting too!'
Utterance: 'So tell me, which is most important to you? What can't you live without?'

Ex Output:

Yes