Hello,.
user
Hello, how can I serve you today?
assistant
I am Nicholas Davis and I want to travel from Oakland, CA - OAK on Apr 29.
user
OK, can I know your returning journey details?
assistant
My returning details are Washington DC - DCA on May 01.
user
Please wait for a moment, I will check your flight.
assistant
OK.
user
Thanks for your patience. Sorry, I did not find any flight on your required details.
assistant
OK, Thank you for your service.
user
Thank you, have a nice day.
assistant