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:       What a pin-up she is !  
 Person2:Can you imagine she's over forty ?  
 Person1:        That's incredible ! She has such a sharp figure .  
 Person2:Absolutely . She's a teacher of aerobics . 

informal