You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

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

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

USER: Sure, my planned travelling dates are Apr 25 and Apr 27.

ASSISTANT: On whose name I have to book the flight ticket?

USER: Sure, my name is Sharon Wright.

ASSISTANT: Do you have any connection limit?

USER: I am comfortable with any connection.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, take your time.

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

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

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