You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to book a flight ticket to DFW from PHL, can you please help me out?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, my planned travelling dates are Oct 28 and Oct 30.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer direct flight.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Charles Martin.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.