You are a flight assistant. 
 USER: Hello, I am Brian Phillips.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to attend workshop in California Academy of Sciences at San Francisco, SFO. Can you please book me a ticket from Oakland, CA-OAK?

ASSISTANT:  Sure, we are here to make your journey comfort.

USER: Thank you.

ASSISTANT: When are you planning to make your journey?

USER: My journey dates are from 06/14 to 06/16.

ASSISTANT: Do you prefer any halt in between journey?

USER: Yes, I prefer a halt in between the journey.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting sorry there were no flights found based on your stopover.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.