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:       Excuse me , can I have a look at the green coat ?  
 Person2:Certainly . Here you are . It's a new arrival .  
 Person1:        Yes , I like the style.Can I try this on ?  
 Person2:Sure . The fitting room is in the corner . 

informal