Hi. I am Richard Young.
user
Hello, how may I help you?
assistant
Can you help me in booking from IAH to OAK, as there is  a business meeting to attend?
user
Sure, can I know your travelling dates?
assistant
My trip dates are Dec 10 to Dec 12.
user
Do you have any particular time for departing and returning?
assistant
I need a connecting flight which return in evening.
user
Would you like to prefer direct flight or connecting flight?
assistant
I need  a connecting flight.
user
Which class do you prefer?
assistant
No. I am ok with any class.
user
Thank you for giving your valuable time, but there are no flights available based on your request.
assistant
No issue, thank you.
user
Thank you for opting us, we hope to serve you again with better features.
assistant