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:       Where do you usually do your shopping , Mrs . Lane ?  
 Person2:I usually go to the supermarket , near the station .  
 Person1:        How do you find the prices there ?  
 Person2:I think they are quite reasonable , and the vegetables are very fresh .  
 Person1:        I see you have bought some coffee . Would you mind telling me how much you paid for it ?  
 Person2:Only 2 dollars and 25 cents . 

formal