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:       Hi , Lucy . What are you going to do this weekend ?  
 Person2:I have no idea yet . Do you have any suggestions ?  
 Person1:        Would you like to play tennis with me ?  
 Person2:I'd like to .  
 Person1:        Be sure to get to the sports hall at nine o'clock on Sunday morning .  
 Person2:OK , will do ! 

informal