You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I would like to attend an Environmental Science Conferences in Lawrence Hall of Science at Oakland, OAK. Will you help me in booking a flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your journey dates to book  a flight ticket?

USER: I want to fly out on 07/29 and intend to return on 07/31.

ASSISTANT: May I know your source point?

USER: Source is from San Francisco, SFO.

ASSISTANT: Do you need any stop overs in between your journey?

USER: Yes, I need a stopover in between my journey.

ASSISTANT: Ok, wait for some time I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting there is no flight found on your requested details.

USER: Not a problem, thank you for your information.

ASSISTANT: May I know your name?

USER: My name is Patrick Roberts.

ASSISTANT: Ok, thanks for approaching us.