Simple but fun activity. Have Ss work in pairs, give out the dialogue. Ask them to separate from each other to both of the sides of the classroom (they have to be in fron of each other as far as possible). Then, ask them to complete the dialogue with the missing information. This information is provided by his/her classmate so he/she has to listen carefully while all the rest of the class is yelling. Noisy activity but Ss appreciate having fun while learning!...enjoy!