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:       Would you please put that cigarette out ? I get sick on it .  
 Person2:You do ? OK , fine with me .  
 Person1:        Thank you SO much .  
 Person2:But I also want ya to do me a favor .  
 Person1:        What ?  
 Person2:You gotta have some better deodorant .  
 Person1:        I ’ m sorry ? ! 

informal