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: 'I want to make sure I'm well prepared for camping. How would you feel if I took 2 water, 1 firewood, and 2 food?' 'I really need 3 firewood because I am always cold.'
Utterance: 'If I gave you 3 firewood, would you give me 3 water? I can do without the wood, but the water is really important to stay hydrated.'

Ex Output:
No


Ex Input:
Context: 'Hello, how are you? Looking forward to camping?'
Utterance: 'Oh yeah, that's for sure. What camping item do you prioritize?'

Ex Output:
Yes


Ex Input:
Context: 'I am a campaign partner' 'Oh. What does that mean?' 'No I am the only person who come with you'
Utterance: 'Oh.  Well, which items exactly do you want?'

Ex Output:

Yes