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'.
Q: Person1: We're having a tailgate party I before the game . Would you like to join us ?
Person2:Okay . But what is a tailgate party ?
Person1: Someone brings a truck to the game and we have a barbecue right there in the parking lot out of the back of the truck !
Person2:How fun ! Can I bring something ?
Person1: Don't worry about it ! Just come at five .
Person2:I make a mean potato salad !
Person1: Well , if you insist , you are welcome to bring a potato salad !
Person2:Then I'll see you in the parking lot at five ! Thank you !
A:
informal