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:       Three other people started to bid . One called himself Buddhabuyer , so I knew he meant business . I raised my bid twice , but it kept going up .  
 Person2:How high did the price go ?  
 Person1:        I don't know . I dropped out at $ 250 .  
 Person2:You didn't watch the end of the auction ?  
 Person1:        No . It wasn't the super bargain I thought it was . 

formal