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:       i saw lily for the first time . and fell like i'v been struck by lightening.she is a girl of my dreams . i have a date with her on Friday , but i really can't decide what to do .  
 Person2:what about taking her for a dinner or a movie ?  
 Person1:        not bad , any other ideas ?  
 Person2:well , there is a play on campus this weekend .  
 Person1:        good idea . that ' s why i think i have culture . you have any other suggestions ?  
 Person2:what's the matter with these ideas ?  
 Person1:        They are good , but i still need a few more .  
 Person2:what about going on a picnic ?  
 Person1:        Cool , but what if the weather is not ideal ?  
 Person2:you can also take her to the art museum or a cafe . Certainly , i must come up with something you can use . how do you like the ideas i am giving you ?  
 Person1:        they are all good . 

informal