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:       Excuse me , but I'm looking for a gift for my friend . 
 Person2:Is it a Chinese New Year's gift or a birthday gift ? 
 Person1:        Well , it's a wedding gift . 
 Person2:Oh , I see . Let me guess ... something sexy for the new bride on her first night of marriage ? 
 Person1:        Basically . But I have no idea what to get ! She's American and kind of ... 
 Person2:Well-endowed ? Don't worry . I have some bras with bigger cup sizes in the back . 

formal