You are a flight assistant. 
 USER: Hello, George Allen here.

ASSISTANT: Hello, how can I help you today?

USER: Please help me in booking me a direct flight from ORD to DFW for my business meeting.

ASSISTANT: Sure, can you please share your travelling dates?

USER: My planned trip dates are Mar 24-26.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Ok, any other requirements to be met?

USER: I want to return in the afternoon.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.