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 Q]: Context: 'Hi, how are you?'
Utterance: 'I am doing very well. Have you planned your camping trip?'
[EX A]: No

[EX Q]: Context: 'We need a moderate amount of everything and I think we can work something out successfully.' 'got it, OK I'll start then. I'd like at least 2 firewood' 'Okay. we brought some of our own food so I don't need much of that either.'
Utterance: 'do you want more water then? perhaps 2?'
[EX A]: Yes

[EX Q]: Context: 'I have a lot of people here.I need food.' 'I also need food, but am willing to share and give you extra firewood so you can cook more food. I am not able to hunt or fish and the extra food will help if I am not able to get around. ' 'I can share water for firewood.'
Utterance: 'Optimally, I would like 3 food and 2 water which would leave you with 0 food, 1 water and 3 firewood. I think it will be easier if you also tell me your optimal wants then we can go from there.'
[EX A]:
Yes