Hello.
user
Hello. How may I aid you?
assistant
I am Paul Gonzalez, want to travel from ORD to SFO. Please help me in booking my ticket.
user
Sure, can you please specify me your dates of travel?
assistant
My travelling dates are from 11/07 to 11/09.
user
Would you like to travel in an economy class or in a business class?
assistant
There is no particular class preference.
user
 Is there any another specifications on your trip, so that I can arrange like that only.
assistant
My departing time should be in the evening and my airline preference is normal cost.
user
Sorry, we don't have any flight available for your trip.
assistant
It's ok, thank you for your help.
user
Thanks for consulting us.
assistant