You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Susan Nelson here. Please help me out in booking the ticket from ORD to DFW.

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My trip dates will be Nov 16 to Nov 18.

ASSISTANT: Do you like to go with a economy class or business class?

USER: No.

ASSISTANT: May I know your other specifications?

USER: My return time must be in the afternoon.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: That's ok, thank you.

ASSISTANT: Thanks for choosing us.