You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me to book a flight from OAK to reach SFO?

ASSISTANT:  Yes, I will definitely try my best to help you in booking your flight ticket. Could you please provide your planned dates of journey?

USER: My preferable dates are on Mar 13th to 15th.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer a connected flight.

ASSISTANT: May I know about your other specifications for the journey?

USER: I would like to return in morning time.

ASSISTANT: Can I know your name to proceed further?

USER: Sure, Frank Campbell is my name.

ASSISTANT: Sorry, we have not found any flights running on your desired routes.

USER: No issues, thank you.

ASSISTANT: Thank you for opting us.