You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: Please help me in booking a flight ticket from OAK to LAX.

ASSISTANT: Sure, May I know the travelling dates?

USER: I will start on Aug, 5 and return on Aug, 7.

ASSISTANT: Do you have any connection limit?

USER: I would prefer single connection.

ASSISTANT: Is there any other requirements?

USER: I need to return at evening time.

ASSISTANT: May I know your name?

USER: Kenneth Walker here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.