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:       The Mountains would be a great place for the company retreat .  
 Person2:That's a wonderful choice .  
 Person1:        I have chosen January as the month for this retreat .  
 Person2:January is a little too close to the Christmas holidays .  
 Person1:        Yes , maybe another choice might be better .  
 Person2:I think that April would work . Spring is a lovely time to be in the mountains .  
 Person1:        Thank you for thinking of that .  
 Person2:Maybe if we asked around we could see what people would prefer .  
 Person1:        That is a good idea .  
 Person2:I'll take care of taking the survey and get back to you with the answers . 

informal