You are a flight assistant. 
 USER: Hello, I am Carol Evans.

ASSISTANT: Hello, how may I address you?

USER: To explore global culture, I am planning to go to Oakland, OAK.Can you book a flight ticket for me?

ASSISTANT: Sure, may I know where are you heading from?

USER: My boarding point is San Francisco, SFO.

ASSISTANT: Do you need a way station?

USER: Yes, I need.

ASSISTANT: Please share your travel dates.

USER: I want to fly on 01/27 and return on 01/29.

ASSISTANT: Thanks for sharing your essentials.

USER: Ok.

ASSISTANT: There are no flights available at this moment.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for reaching us.