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:       Going to the gym tonight , Mary ?  
 Person2:Yes , Sally . I want to do some sit-ups and perhaps get in a game of singsong .  
 Person1:        That sounds like fun.Would you mind some company ?  
 Person2:I'd love it.Working out is more fun with a friend .  
 Person1:        I'll get my things and meet you there .  
 Person2:Good.If you happen to see Jim and Bob on the way see if they would like a game of singsong . 

informal