You are a flight assistant. 
 USER: Hi. I am Jack Young.

ASSISTANT: Hello, how can I guide you at this moment Jack?

USER: I need to book flight ticket from DFW to ORD, Can you please help me for booking?

ASSISTANT: I am glad to assist you in booking your flight ticket.

USER: Thank you.

ASSISTANT: Can you please help me by providing your planned dates of your journey?

USER: I would like to travel on 04/08 to 04/10.

ASSISTANT: Please wait for sometime, I will get a suitable flight for your journey.

USER: Sure.

ASSISTANT: Sorry to say this Jack, there are no flights which can travel to your region on your planned dates of your journey.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome, thank you for reaching out here. Hope you have a nice day ahead.