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:       What channel did you watch last night ?  
 Person2:Channel 24.It shows some cable networks and no commercial interruptions .  
 Person1:        You did ? How do you like the fashion show ?  
 Person2:It was very good . I followed it right to the end . 

informal