You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Rebecca Roberts here.

ASSISTANT: Welcome to flight booking agency Rebecca.

USER: I need to attend a business meeting at Philadelphia, can you please help me in booking a flight ticket from DFW to PHL?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your planned dates of travelling?

USER: Sure, my trip dates are from 09/01 to 09/03.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure, I will wait for your response.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: That. No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.