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:       Oh , my god . I am so heavy now . I gain 10 kilos .  
 Person2:I am going to the gym . Do you want to come with me ?  
 Person1:        I think I should go . I really need to lose some weight .  
 Person2:Then , I'll wait for you at the car park in 20 minutes .  
 Person1:        0K.See you then .  
 Person2:Do you have your member card with you ?  
 Person1:        Nope , I do not have a membership yet .  
 Person2:Well I have a guest ticket . You can use it .  
 Person1:        That is so nice of you . If I like the service and the training equipment , I think I well join the club . 

informal