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: 'Then it is good deal.  I need two wood, 1 food, and 1 water.' 'I really need all the food, I have a lot of people to feed' 'I will provide you the food, but I am asking only one for my people.'
Utterance: 'I am giving you all the water,  how come you need the food? '

Ex Output:
Yes


Ex Input:
Context: 
Utterance: 'hai friend. i am in some trouble i need some help from you. can you help me?'

Ex Output:
No


Ex Input:
Context: 'Hello '
Utterance: 'Hello! I am excited for my upcoming camping trip. Mostly I will need water. How about you?'

Ex Output:

Yes