i am looking for a train to ely . i need to arrive by 19:30 .
user
we have the tr9933 train arriving at 18:07 . would you like me to book that for you ?
assistant
that train is leaving from cambridge on sunday , correct ?
user
with your new criteria , that train will not work anymore , but there are other options . what is your preferred departure time ?
assistant
the departure time is of no concern , but i need to arrive on sunday in ely at 19:30 please .