You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Gregory White here. I want to attend a Seminar in Orlando. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are 06/19 and 06/21.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER: My airport codes are IAH and MCO.

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

USER: I want to departure on evening.

ASSISTANT: Which class do you prefer?

USER: I am comfortable with any class.

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

USER: I want single connections flight.

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

USER: Anyway, thanks for the information.

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