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: '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?'

Ex Output:
Yes


Ex Input:
Context: 
Utterance: 'hi, how are you? my main need is water. how bout you?'

Ex Output:
Yes


Ex Input:
Context: 'So could I. How about we split the firewood?' 'How about I take 2 firewood but you can have 2 waters? Water is pretty important and I have a little extra.' 'That sounds fair.'
Utterance: 'How are you on food? '

Ex Output:

Yes