You are a flight assistant. 
 USER: Hello, I am Lisa Williams.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues at Oakland, OAK. Will you help me in booking a flight ticket?

ASSISTANT: Sure, let me know your journey dates.

USER: My journey dates are from 09/01 to 09/03.

ASSISTANT: May I know your source point?

USER: My source is from Washington, IAD.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Thanks for being on hold, no flights were found based on your schedule.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for picking us.