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:       Can you go to the store for me ?  
 Person2:Sure , I can go to the store for you . What do you need ?  
 Person1:        Just a couple things , here's a list .  
 Person2:Is there anything else that you want me to pick up ?  
 Person1:        No , I think that's all that I need .  
 Person2:Is there any other place you would like me to go to for you ?  
 Person1:        If you can , could you pick up my prescription for me ?  
 Person2:Sure , no problem . Is your prescription ready ?  
 Person1:        I think so . It should be .  
 Person2:Okay , I'll pick it up for you .  
 Person1:        Thank you so much .  
 Person2:You're welcome . 

informal