Hello.
user
Hello, how can I assist you for the day?
assistant
I am Jonathan Jones, help me to book a direct flight to Washington city to visit National Museum of  Natural History with my family.
user
Sure, I am here to help you. When you are willing to travel?
assistant
I plan to travel on 06/21 and return on 06/23.
user
Can you help me with your airport codes?
assistant
My source point is TX-DFW and destination is DC-IAD.
user
Please wait for a moment.
assistant
Sure.
user
Sorry, we found no flights on your given dates.
assistant
Ok, thanks for the details.
user
Thank you for reaching us.
assistant