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:       You say he was around average height .  
 Person2:Yes , that's right , around five nine five ten .  
 Person1:        Weight ?  
 Person2:I'm not sure . Medium I suppose . Maybe a little on the heavy side .  
 Person1:        Any marks on his face ?  
 Person2:No , I don't think so .  
 Person1:        Glasses ?  
 Person2:No .  
 Person1:        What about his hair ?  
 Person2:Black or dark brown .  
 Person1:        Long or short ? Straight ? Curly ?  
 Person2:Straight , I think , and about average length  
 Person1:        Boy , this sure doesn't help us much . It could be anybody . How about his cloth ? What was he wearing ? 

formal