Task-oriented dialogue about: train

I'm looking for a train from Cambridge.
Let me help you with that, where would you like to go?
I need to get to Stansted airport please.
What day will you be traveling?
I'd like to travel on thursday
What time do you need to leave or arrive by?
I need to leave after 16:15.
Ok there is one leaving at the same time i'm eager to book it for you