Hello.
Hello, how can I assist you today?
 As I am a scientist, I want to attend science festival with my students at Chicago. Can you do the reservation?
Sure, may I know your planned travel dates?
Dates are 04/16 and 04/18.
May I know your source and destination codes?
My airport codes are LAS-ORD.
Your good name please.
Andrew Martinez here.
Sorry to say that, no flights were found with your given details.
No problem, Thank you for kind service.
Thank you for opting us.