Hi,.
user
Hello. How may I assist you today?
assistant
 I would like to visit Houston Arboretum and Nature Center at Houston, TX - HOU. Can you help me with booking flight ticket?
user
Sure, I will help you but I need your travel dates to search best flight for you.
assistant
Thanks for responding. I want to travel on 08/16 and intend to return on 08/18.
user
From which place you want take boarding?
assistant
I want to board from Seattle, WA - SEA.
user
May I know your name to proceed further?
assistant
Sure, David Thompson is my name.
user
Sorry for this inconvenience, I could not find any flight with your travel dates.
assistant
Ok, not a problem. Thanks for your kind information.
user
It's my pleasure, have a nice day.
assistant