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:       Do you have cold medicine ?  
 Person2:Yes , but do you have a prescription with you ?  
 Person1:        No , I don't .  
 Person2:I'm afraid you can't buy any medicine without a prescription from a doctor .  
 Person1:        I have a headache . Is there anything I can buy without a prescription ?  
 Person2:Then you can buy Aspirin .  
 Person1:        I will take the Aspirin then . And have you a small first-aid kit ?  
 Person2:Yes , here this is .  
 Person1:        I'll take it too .  
 Person2:Thank you and take care . 

formal