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:       Your request for compensation makes me surprised . What happened ?  
 Person2:It is because of the quality .  
 Person1:        Could you tell me the particulars ?  
 Person2:I told you that we want first-class goods . So the quality , specification and price are clarified in our contract . Do you remember those details ?  
 Person1:        Yes , I do .  
 Person2:The re-examination results indicate that one-third of the goods are not up to standard .  
 Person1:        Really ? We began to load the goods after we made sure they were qualified .  
 Person2:I told you the truth . According to the contract , if you fail to honor the contract , we are entitled to cancel it . 

formal