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:       I wonder if we can change to Channel 26 .  
 Person2:Why ? I'd like to see what's on that channel .  
 Person1:        A lecture on how to make stir-fried ginger beef , not the boxing you like .  
 Person2:I prefer boxing to beef . 

formal