You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Charles Lewis. I need to attend my sister marriage at Oakland, can you please help me to book a flight ticket from BOS to OAK?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my journey dates are Dec 29 and Dec 31.

ASSISTANT: Could you please provide the departure and return time?

USER: My departing time is afternoon.

ASSISTANT: May I know the connection limit please?

USER: I need a connecting limit.

ASSISTANT: Do you have any requirements?

USER: No.

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.