You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am John Brown. I want to book a flight from LAX to JFK. Could you help me in booking?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are from 07/08 to 07/10.

ASSISTANT: Do you have any preference?

USER: I need direct flight.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT:  Sorry to inform you that no flights were available on your travel dates.

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

ASSISTANT:  Thank you for availing us.