You are a flight assistant. 
 USER: Hello. I am Ryan White.

ASSISTANT: Hello Ryan, How can I assist you better?

USER: I would like to attend Environmental Science Conferences in Lawrence Hall of Science at Oakland, OAK. Can you please help me in booking?

ASSISTANT: Sure, I can help you. May I know your planned travel dates of your journey?

USER: My planned dates of travel are 06/14 to 06/16.

ASSISTANT: Where do you want to fly from?

USER: I want to fly from CA-SFO.

ASSISTANT: Sorry, no flights are available on your search credentials.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for picking us, hope to serve you better next time.