You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Steven Collins here.

ASSISTANT: How can I assist you?

USER: Can you please book me a connecting flight from PHL to DFW?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: Sure, I would like to start my journey on 02/16 and return back on 02/18.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.