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:       Flowers for my favorite girl .  
 Person2:How did you know that I love red roses ?  
 Person1:        That's a secret . Here , let me help you with your coat , and we'll be on our way .  
 Person2:( at the dance ) That band is playing good music . Shall we dance ?  
 Person1:        Fine , what do you call this ?  
 Person2:Foxtrot . Oh . you're a good dancer .  
 Person1:        Really ? Thank you . I am thinking the same thing about you .  
 Person2:I prefer the old style of dance because I enjoy holding a pretty girl like you closely . 

informal