You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me in booking a flight ticket from HOU to DCA?

ASSISTANT: Sure, when are you planning to travel?

USER: Sure, my travel dates are from Nov 22 to Nov 24.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you prefer a economy class or a business class?

USER: I prefer economy class.

ASSISTANT: Can I know your good name?

USER: Myself Susan Roberts. Please make sure that, I would like to return in the afternoon.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you.