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:       Henry , do you know how much we spent this month ?  
 Person2:No , I'm not clear .  
 Person1:        we've spent $ 1,000 .  
 Person2:Don't make a fuss.The price is rising 

formal