You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER:  I am Debra Garcia want to travel from PA-PHL to TX-DFW to attend a press conference. Can you book a direct flight?

ASSISTANT: Sure, we are here to assist you. May I know your travel dates?

USER: My travel dates are 08/25 and 08/27.

ASSISTANT: Sorry to inform you that, no flights are available on your requirement.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thanks you for availing us.