You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Allen here.

ASSISTANT: How can I help you today?

USER: I would like to visit Oakland to meet my best friend, can you help me to book a flight ticket from SFO to OAK?

ASSISTANT: Please share me your travelling dates.

USER:  My travelling dates are 05 and 07 of May.

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a break.

ASSISTANT: May I know your depart and arrival time?

USER: My return time should be in the afternoon.

ASSISTANT: Sorry to inform you that there are no flights available on your route.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.