You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in booking my flight ticket from IAD to LAS?

ASSISTANT: Please provide your trip dates.

USER: My trip dates are Mar 04 and Mar 06.

ASSISTANT: Do you need any connecting flight.

USER: I need connecting flight.

ASSISTANT: Do you need any other specifications?

USER: I need my return ticket at afternoon time.

ASSISTANT: May I know your name?

USER: Myself Amy Martinez.

ASSISTANT: There are no flights available on your dates.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.