You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Young.

ASSISTANT: Kathleen Young, how may I aid you?

USER: I am looking for a flight from ATL to OAK, can you please help me in booking a flight ticket?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My travelling dates are Aug 17 and Aug 19.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight and my departure time is evening.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.