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: 
Utterance: 'Hello fellow camper! I am interested to know your preference in items?'

Ex Output:
Yes


Ex Input:
Context: 'Okay that would be fine. If I can have 3 packages of firewood, you can have 2 packages of food. Does that work?' 'That does not work for me. I need at least one package of firewood. I'm sure you understand, because it seems like we have medical conditions with similar effects. You can take all of the water if I can get 2 packages of food and 1 of firewood. Does that work?' 'I do understand. That will work for me. '
Utterance: 'Could you tell me about why you want water? '

Ex Output:
Yes


Ex Input:
Context: 'Hi, I will need alot of water as I need it to stay alive.' 'I agree, with camping i feel there are many uncertainties. Finding clean water would be too difficult, best to take as much water as possible. ' 'I will also need some Firewood too to start a fire'
Utterance: 'I feel for firewood we dont need as much, as we are going to be camping, with that means, in my opinion, with branches and brush available, maybe we can take 2 fire woods, what do you think?'

Ex Output:

No