i need to book a train for 18:45 that leaves cambridge .
user
what is your final destination ?
assistant
norwich is my final destination .
user
do you have a day in mind ?
assistant
i will be traveling on friday .
user
i have a train that leaves on friday at 19:36 and arrives in norwich at 20:55 . would you like me to book it for you ?
assistant
actually , i was not very clear before . i apologize . i need to arrive in cambridge by 18:45 .
user
tr4990 departs norwich at 17:16 and arrives in cambridge at 18:35 . will that work for you ?
assistant
yes , i think it will . how long is the trip and how much will it cost me ?
user
how many tickets will you need ?
assistant
just the 1