Hello.
user
Hello, How can I be of your help?
assistant
 I am Emily Gonzalez want to book a ticket from PHL to DCA. Can you book a connecting flight?
user
Sure, on what dates you prefer to travel?
assistant
 My travel dates are 12/21 and 12/23.
user
Please wait for a moment.
assistant
 Ok.
user
Sorry, there were no flights found based on your request.
assistant
Ok, thank you for your response.
user
Thanks for communicating with us.
assistant