You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Lee.

ASSISTANT: How can I help you now?

USER: I want to book a flight ticket from MCO to PHL. Could you help me in booking?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travelling dates are from Mar 23-25.

ASSISTANT: Do you have any connection limit?

USER: I need direct flight.

ASSISTANT: May I know about your class preference?

USER: I prefer for economy class.

ASSISTANT: Do you have any other specifications?

USER: My return time should be in the evening.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no flights are available as per your specifications.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us, have a good day.