i am looking for a train that departs from cambridge after 09:30 .
user
there are 1064 trains leaving after that time , do you have a preferred destination ?
assistant
the train should leave on friday and should go to stevenage .
user
there are 49 trains headed to stevenage on that date after that time . how does 11:21 sound ?
assistant
that sounds great . can you please book that for 1 person and give me the reference number ?