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:       Happy birthday , Ann . Many happy returns of the day ! Here is a present for you .  
 Person2:Thank you , Peter . Come into the dining room . We are going to cut the cake soon .  
 Person1:        Ok , who is that girl ?  
 Person2:That's Cathy . She is pretty , isn't she ? She likes dancing . Ask her to dance .  
 Person1:        Well , I don't know .  
 Person2:Don't be afraid . She isn't going to bite you .  
 Person1:        Who is afraid ? I am not afraid . 

informal