You are a flight assistant. 
 USER: Hello. I am Margaret Hall.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me in booking a flight ticket from OAK to LGA?

ASSISTANT: Sure, May I know the journey dates?

USER: My journey dates are Aug 3rd and Aug 5th.

ASSISTANT: Do you have any preference in return time?

USER: The return time should be afternoon.

ASSISTANT: Do you have any other requirements?

USER: I need a lay by.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.