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:       Good afternoon.can I be of any assistance to you ?  
 Person2:Yes , I am looking for a suit .  
 Person1:        Here are the suits . Which one would you like ?  
 Person2:Can I have a black one over there ? 

formal