You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: To give a presentation at Oakland, I am planning to travel from Los Angeles. Can you help me book a direct flight?

ASSISTANT: Sure, I will help you to book a direct flight to Los Angles. Please share me your source and destination airport code?

USER: My source is LAX and destination is OAK.

ASSISTANT: Please mention budget for flight ticket?

USER: I can pay up-to 200.

ASSISTANT: Please share me your planned journey dates?

USER: They are planned on 10/31 and 11/02.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, Sorry there is no direct flight is available on your journey route.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for visiting us, have a nice day ahead.