You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please book a flight ticket from OAK to JFK?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are Oct 6th and Oct 8th.

ASSISTANT: Do you have any connecting flight preferences?

USER: I need a direct flight.

ASSISTANT: Is there any other concern?

USER: No.

ASSISTANT: May I know your name please?

USER: Charles Wilson.

ASSISTANT: No flights found as per your preferences.

USER: No issues. Thank you.

ASSISTANT: Thank you.