Hello, I am Barbara Hill.
user
Hello. How may I help you out?
assistant
Can you please help me to book a flight ticket from DCA - HOU?
user
Sure, I will help you in booking the ticket. May I know your travelling dates please?
assistant
My travelling dates are 07/22 to 07/24.
user
Sorry, there are no flights found in our database.
assistant
No problem, thanks for your information.
user
Thank you for choosing us.
assistant