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:       Have you got anything for diarrhea ?  
 Person2:Yes , here you are . These tablets are very effective .  
 Person1:        How should I take this medicine ?  
 Person2:Take two tablets every six hours .  
 Person1:        I see . I'll follow your instructions .  
 Person2:And take a good rest for a few days .  
 Person1:        Thank you . 

formal