You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Amanda Thomas. Can you please help me in booking my flight ticket from DCA to HOU?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are Sept 03 and Sept 05.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I want my return ticket at afternoon time.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need direct flight.

ASSISTANT: Which class do you prefer?

USER: No.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: Ok, fine thank you for your information.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.