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:       Ann , stop bugging Jess and help me order something new . Lattes are so passe these days .  
 Person2:Why don't you try an Americano ? Espresso with water .  
 Person1:        Sounds a little weak .  
 Person2:Go with a hammerhead then-espresso mixed with drip coffee .  
 Person1:        Sounds better , but I hope it doesn't inspire me to take a hammer to the client's head .  
 Person2:Don't worry , James . We'll get this case worked out in no time . 

informal