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:       We have mild wines and strong liquors . Which kind do you prefer ?  
 Person2:I've no idea . I'd like to listen to your suggestion .  
 Person1:        It's my pleasure . Actually , it's really hard to say as individual tastes are different . As for myself , I'd like to recommend gin and tonic .  
 Person2:Well , I'll try gin and tonic . 

informal