Hi, can you help me book a flight?
Where are you departing from?
Chicago
Where are you going to?
I'm sorry, I changed my mind. I want to leave from San Francisco. I'm headed to Detroit.
On what day do you want the plane to arrive?
Any day will be fine. I'll plan my trip around it.
I found a flight on the 24th for 205 credits.
That would be perfect. Will you book it for me, please?
May I have your name, please?
John
Sorry, but the flight with id '518' is not available any more.
what about 639?
Sorry, but the flight with id '639' is not available any more.
Maybe it's because of the weather. What's the weather in Detroit supposed to be like?
It will be Cloudy all day on Sunday in Detroit, with temperatures of around 24 degrees celsius.
well that doesn't sound too bad. Can you find a flight that works? Any cost under 500 credits is fine. 
I found a flight on the 1st, would that work?
Yes!
The flight is available. Should I reserve it for you?
Yes, please book it.
Right, your flight is now reserved!
Thank you so much. I think that's all I need!
Thank you and goodbye.