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 are you doing this weekend ?  
 Person2:I am not sure . What are you doing ?  
 Person1:        I was thinking of maybe taking a drive to the beach .  
 Person2:That sounds like a great idea !  
 Person1:        Would you be interested in joining me ?  
 Person2:Sure , I would love to go with you . When would you be leaving ?  
 Person1:        I thought that we could leave around 8  
 Person2:That would give us plenty of time to explore . Did you know that there is a music festival on the beach in Santa Barbara ?  
 Person1:        That was part of my plan .  
 Person2:Well then , I'll see you on Saturday . Thanks for asking me to go with you . 

informal