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:       Are you there , Mary ?  
 Person2:I'm back . My bid on the Buddha is still the highest !  
 Person1:        How much is my stamp ?  
 Person2:Don't you want to hear more about my statue ?  
 Person1:        Don't get ahead of yourself . Fat boy isn't yours yet .  
 Person2:His name is not fat boy ! You can be so rude sometimes . 

informal