Hello, Thomas Miller here.
user
Hello, how can I assist you?
assistant
 I would like to visit Library of Congress at Washington to collect some information from old Newspapers, which helps me to write an Article about corruption. Can you book a direct flight?
user
Sure, please share me your airport codes.
assistant
I would like to travel from Los Angeles, CA - LAX. My destination airport code is DC - IAD.
user
Can I know your travel dates please?
assistant
My travel dates are 09/12 and 09/14.
user
Sorry for the inconvenience, there are no flights with your requirement.
assistant
Ok, no issues. Thank you.
user
Have a good day.
assistant