Hello. I am Joshua Parker.
user
Hello, how may I help you today?
assistant
 I want to visit Houston Zoo, TX-IAH with my sister. Can you book a direct flight?
user
Sure, can you please help me with your journey dates?
assistant
My travel dates are 12/08 and 12/10.
user
May I know your origin airport code please?
assistant
 I will depart from PA-PHL.
user
Please wait for a while.
assistant
Ok.
user
Sorry, there is no flight found on your given details.
assistant
Thanks for your help.
user
Thanks for choosing us.
assistant