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.

Q: Context: 'How are you today? Did you have any preferences on the supplies we will be trading?'
Utterance: 'I am good. How about yourself? I think I would like some firewood to start off with. We like to have bigger fires. What about you?'

A: Yes
****
Q: Context: 
Utterance: 'Hello, what is your preference for supplies?  I would prefer to have as much extra firewood as possible, but am relatively indifferent to the rest.'

A: Yes
****
Q: Context: 'I dont think I am okay with that ☹️. Food is essential to our groups morale when camping. We would like 1 additional food preferably.' 'Well you guys did say you did not care much about large fires. What if you gave all the firewood in replace for the water and you can still keep 1 food?' 'So I would get 3 water and 1 food and youd get 3 firewood and 2 food?'
Utterance: 'Yea that seems like an alright trade to me 🙂'

A:
No
****