You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I be of your help?

USER:  I am Emily Gonzalez want to book a ticket from PHL to DCA. Can you book a connecting flight?

ASSISTANT: Sure, on what dates you prefer to travel?

USER:  My travel dates are 12/21 and 12/23.

ASSISTANT: Please wait for a moment.

USER:  Ok.

ASSISTANT: Sorry, there were no flights found based on your request.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for communicating with us.