You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Daniel Lopez, can you help me to book a flight from OAK to SFO?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are Aug 23 and 25.

ASSISTANT: Is there any class preference for you?

USER: I am fine with any class. I want to return at afternoon.

ASSISTANT: May I know your connection limit?

USER: Please book a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us.