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 ! Tom . Want to go to play bowling tonight ?  
 Person2:Sounds good . When and where shall we meet ?  
 Person1:        Let me see . How about 6:30 at the gate of the club ?  
 Person2:Fine , see you then . 

informal