Hi, my name is John. Can you help me find a flight from Chicago to Pittsburgh?
Where are you departing from?
Chicago
On what day do you want the plane to arrive?
26th
Unfortunately there are no flights that match your search. Would you like to change any of your criteria?
Let's try the 25th.
Unfortunately there are no flights that match your search. Would you like to change any of your criteria?
Let's try the 23rd or the 24th.
Right, I found an Economy flight with Delta for 274 credits
 that takes 3 hours to get to Los Angeles.
Okay, can you see if that flight is still available?
The flight is available. Should I reserve it for you?
Wait a minute, that flight is going to Los Angeles. I want to go to Pittsburgh.
Unfortunately there are no flights that match your search. Would you like to change any of your criteria?
Keep trying new dates until you find a flight from Chicago to Pittsburgh please.
Right, I found a First flight with Delta for 351 credits
 that takes 2 hours to get to Pittsburgh.
Great, if that flight is available, then please book it.
Right, your flight is now reserved!
Thanks. Have you ever been to Pittsburgh?
I haven't. 
Oh alright. Well, cya later.
Thank you and goodbye.