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:       more and more Chinese are marrying foreigners . 
 Person2:that's true . But I have a low opinion of those women who go out with foreigners . 
 Person1:        oh , why ? 
 Person2:I think some Chinese wone marry foreigners for money while others just want to live abroad . There is no true love between them . 
 Person1:        I wouldn't say that's totally true . I've met many happy intercultural couples . 
 Person2:well , then why aren't there many East-West couples where the man is a Chinese and the woman is a Westerner ? 
 Person1:        I guess it's because the Chinese women are more attractive to Western men . 
 Person2:or because they are less attractive to to Chinese men . 
 Person1:        what do you mean ? 
 Person2:you know , usually the woman is in her thirties and she is a left girl . 
 Person1:        a left girl ? What's that ? 
 Person2:they're called that because they're left behind on the shelf . They're also known by their three H's---high diploma , high salary , and high degree . and they're also known as the three S's — single , 
 Person1:        you have a point here , but I believe some mixed marriages are based on true love . 
 Person2:that ' for sure but very few . 

informal