You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Helen Gonzalez, I want to book a flight on 12/16 to visit Pacific Pin museum.

ASSISTANT: Sure, can you please share me your journey locations?

USER: Can you book a direct flight for me?

ASSISTANT: Ok.

USER: My source point is CA-SFO and destination is CA-OAK.

ASSISTANT: May I know when would you like to arrive?

USER: I will arrive on 12/18.

ASSISTANT: We are sorry to inform, there is no direct flight found.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.