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:       Let's do something really nice for our family this Christmas .  
 Person2:What did you have in mind ?  
 Person1:        I don't know yet .  
 Person2:I just know I want to get out of the mindless gift trap .  
 Person1:        I know what you mean .  
 Person2:I want to give a gift that is really meaningful .  
 Person1:        Or do something that shows we have spent time thinking about them .  
 Person2:Or what only we are able to give them . 

formal