Mr . : Are you Mary Lin ?
neutral
user
Yes .
neutral
assistant
Mr . : I'm Mr . Rogers , your homeroom teacher .
neutral
user
Where should I sit ?
neutral
assistant
Mr . : Why don't you sit behind Brad ?
neutral
user
Who's Brad ?
neutral
assistant
Mr . : He's that guy in the blue shirt .
neutral
user
When does the first period begin , by the way ?
neutral
assistant