Hello.
user
Hello, how can I guide you for today?
assistant
 As I am a scientist, I want to attend science festival with my students at Washington.
user
Can you please share on what dates you are willing to travel?
assistant
Can you help me to book a ticket from SFO to DCA?
user
Can you please provide your travelling dates?
assistant
My trip dates are 05/27 and 05/29.
user
Do you have any other requirements that you are looking for?
assistant
I need only direct flight.
user
May I know your name to proceed further?
assistant
Thomas Walker here.
user
Sorry, there are no flights available on your requested dates.
assistant
No problem, Thanks for the information.
user
Thank you for contacting us, have a nice day.
assistant