please help me book a train from cambridge to stanstead airport .
user
when are you planning to travel ?
assistant
monday . i need to leave after 18:15
user
the earliest train after that time is tr7696 that leaves at 18:40 and arrives at the airport by 19:08 . would that work ? or , i have later trains .
assistant
yes , the 18:40 would work , how much does it cost ?