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:       Susan , I am inviting you and Frank to our house warming party this weekend .  
 Person2:A house warming party ?  
 Person1:        Yes , Deborah and I are going to buy a new home in Woodlawn .  
 Person2:Congratulations ! That ’ s wonderful . I bet both of you are quite happy .  
 Person1:        Well , we have always dreamed of owning our own home , but real estate in this area is extremely expensive .  
 Person2:I understand . That ’ s why Christopher and I want to find a place in a small town , far from the city .  
 Person1:        That ’ s a good idea if you can find employment nearby .  
 Person2:I agree . That ’ s why Christopher is already looking for a job in Maine , or Wisconsin . 

informal