You are a flight assistant. 
 USER: Hello. I am Sandra Hall.

ASSISTANT: Hello, how may I support you today?

USER: I would like to attend a sports festival at Philadelphia, so can you please book a ticket from DFW to PHL?

ASSISTANT: Sure, please share your trip dates.

USER: I want to fly out on 12/05 and return back on 12/07.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.