You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you at this moment?

USER: Can you please help me in booking my flight ticket from JFK to OAK?

ASSISTANT: On which dates would you like to travel?

USER: My travelling dates are Sept 11 and 13.

ASSISTANT: Do you need a stop over in between the journey?

USER: I need direct flight.

ASSISTANT: Can I have your name please?

USER: Myself Elizabeth Hill.

ASSISTANT: There are no flights found on your requested dates.

USER: thanks for your information.

ASSISTANT: Thank you for reaching us.