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'.

Person1: You won one million yuan in a lottery . What will you say ?
Person2:I don't know . I'm too excited to say a word .
Person1: I understand . It's too good to be true , isn't it ?
Person2:Yes , too good to be true .
informal

Person1: Are you going to the party on Saturday ?
Person2:I was thinking about it . Are you ?
Person1: Yeah , I heard it's going to be a lot of fun .
Person2:Really ? Well , what time does it start ?
Person1: It starts at 8
Person2:Well , who all is going to be there ?
Person1: Everyone from school .
Person2:How do you know it's going to be so fun ?
Person1: This party is going to have a DJ , food , and drinks .
Person2:Wow , that does sound like it's going to be fun .
Person1: So am I going to see you at the party ?
Person2:Yeah , I will be there .
informal

Person1: Come in , come in , what can I do for you ?
Person2:Professor Donald , are you giving your advanced geology course again next semester ?
Person1: Yes , I am applying on it .
Person2:I wonder if I could enroll in it . I know it is a graduate course and I ' m a junior , but ...
Person1: Aren't you a bit young ? I have a lot of qualified seniors to take the course and they usually have a hard time keeping up .
Person2:I know , but the geology of the American west is my major interest and I have done a large reading in the field .
Person1: Well , if you think you are ready , I'll let you enroll .
Person2:Oh , thanks , professor Donald . This is really very nice of you .
informal