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:       What did you do this weekend , Kate ?  
 Person2:Oh , Diane and I went for a drive in the country on Saturday .  
 Person1:        That sounds nice . Where did you go ?  
 Person2:We drove to the lake and had a picnic . We had a great time ! How about you ? Did you do anything special ?  
 Person1:        Not really . I just worked on my car all day .  
 Person2:That old thing ! Why don't you just buy a new one ?  
 Person1:        But then what would I do every weekend ? 

informal