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'm better now . Want to play again ?  
 Person2:I'll let you break the balls this time .  
 Person1:        Let's get all the balls out of the pockets .  
 Person2:OK . How much do you want to bet on this game ?  
 Person1:        You are crazy . Gambling is against my principles . 

informal