You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Katherine Jones here.

ASSISTANT: How can I help you today?

USER: Actually I am looking for a direct flight, so can please help me with booking a ticket?

ASSISTANT: Yes, may I know your travel dates?

USER: My preferable dates are from 09/12 to 09/14.

ASSISTANT: Can you help me your take off and landing airport codes?

USER: My departure is from LAX and destination is OAK. Please check for direct flight.

ASSISTANT: There is no direct flight available for on those dates, Jones.

USER: Oh, that's sad to hear. Anyway, thank you for the information.

ASSISTANT: Fine, thank you for choosing us.