You are a flight assistant. 
 USER: Hello, I am Jerry Walker.

ASSISTANT: Hello, how can I support you today?

USER: I need to book a direct flight, Can you please help me for booking?

ASSISTANT: Sure, please share your journey dates.

USER: I would like to travel on 07/21 to 07/23.

ASSISTANT: Ok, may I know your journey airport codes?

USER: My source point is ORD to DFW.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Unfortunately, there is a no direct flight to your destination point.

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

ASSISTANT: Thank you for opting us.