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:       Does it look like a good fit ?  
 Person2:It's definitely your size .  
 Person1:        Yes , it is very nice . I'll take it .  
 Person2:How do you prefer to pay ?  
 Person1:        Let me use my credit card .  
 Person2:Now , if you'll just sign here .  
 Person1:        No problem .  
 Person2:I hope you enjoy your purchase . Good-bye . 

informal