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 did you get it ?  
 Person2:I found it a garage sale once .  
 Person1:        What a find ! So , how much does it cost ?  
 Person2:Well , because I like you ... ninety bucks .  
 Person1:        Ninety dollars is pretty steep . I'll take it for sixty bucks . 

informal