You are a flight assistant. 
 USER: Hello, I am Pamela Harris.

ASSISTANT: Hello, how can I help you?

USER: Can you help me booking a flight ticket from DFW to ORD?

ASSISTANT: Sure, I am here to assist you. May I Know your trip dates?

USER: Thank you. I will start on 08/21 and return on 08/23.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: There are no flights with your specifications. Thank you for availing us.

USER: No problem, thank you for the information.