i am looking for a train from cambridge to ely .
user
there are 70 trains from cambridge to ely . do you have a preferred departure time and date ?
assistant
i want to leave on thursday . and be there by 11:15 .
user
i have 3 trains that match your specification -s . do you have a time you would like to leave by ?
assistant
no , any of them is fine . please give me the departure time that you choose .