Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       How much do you pay wholesale for your products ? 
 Person2:We have a few different wholesale vendors , so our cost varies a bit over the fiscal year . But the difference is miniscule , a fluctuation of about 0.2 % . 
 Person1:        That must impact your bottom line at least a little bit , doesn't it ? After all , your sticker price is pretty much set in stone . How much do they go for retail ? 
 Person2:Retail price is 29.95 per unit . We take into consideration changes in supply cost when figuring this price . 
 Person1:        Is that including tax ? 
 Person2:No , that's the price before tax . The tax rate is varies from different marketing areas , so it is difficult for us to figure in . 
 Person1:        How much is your profit margin then ? 
 Person2:Our profit margin is in the neighborhood of 20 % . 

formal