yeah , could you find me a train ? i am in cambridge , and i would like to go over to birmingham new street .
user
there are 133 trains making that trip , do you have a day and time you would like to go ?
assistant
yes , i would like to leave after 21:00 on wednesday .
user
i have a train that departs at 21:01 and 2 more each a hour later than the first . which train would you like to book ?
assistant
i will take the 21:01 . the ticket is just for me and i would like a reference number after the booking is completed .