You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, we are gladly here at your service.

USER: I am Scott Hall and I want to book a flight ticket.

ASSISTANT: Sure, could you please provide your journey details to proceed further?

USER: My travelling dates are from 09/29 to 10/01.

ASSISTANT: Ok, can I have your price limit and preference connections?

USER: I need a direct flight.

ASSISTANT: Ok, may I know your airport codes?

USER:  Sure, My airport codes are from TX-DFW to PA-PHL.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry, unfortunately no flights matching your criterion.

USER: No issue. Thank you.

ASSISTANT: Thanks for your interest, have a great day ahead.