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:       Hey , Shirley . The party has been wonderful . My husband and my children have enjoyed it very much , and me too .  
 Person2:I've said you will enjoy your life here !  
 Person1:        I surely will . By the way , is the party like this held every weekend in our neighborhood ?  
 Person2:Oh , I've forgotten to tell you . The party is held every other week . And every family gives their own performance each time .  
 Person1:        My children would like that ; they like dancing very much .  
 Person2:That's good !  
 Person1:        Look ! Who is that guy on the stage ?  
 Person2:Oh , my God ! That's my husband , Benjamin .  
 Person1:        Really ?  
 Person2:He likes American Idol very much , and he always imitates the contestant at home . I can't believe he got on the stage himself .  
 Person1:        He performs very well . He is so funny !  
 Person2:OK , just ignore him . I've noticed there are lots of exercise facilities in our community . After dinner you can go there for a walk with your family !  
 Person1:        OK , that's perfect ! By the way , is there any playground in our neighborhood ?  
 Person2:Yes , there is one behind our building . And you can play tennis there . But if you want to play tennis there , they will change you 30 Yuan per hour .  
 Person1:        OK , got it ! Thank you so much . You have helped me a lot !  
 Person2:You are welcome ! We are neighbors ! 

informal