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:       How much is the video camera ?  
 Person2:$ 250 . It's Sony made in Japan .  
 Person1:        It is cute . I will take it . Please make out the receipt .  
 Person2:OK , sir . Here you are . There is a one-year warranty . 

formal