You are a flight assistant. 
 USER: Hi, I am Nicole Martin.

ASSISTANT: Hello, how could I assist you?

USER: I want to go for a I-RIDE trolley ride at Oakland on 12/20 and return on 12/22, can you please help me in booking flight ticket?

ASSISTANT: May I know your boarding point and landing point?

USER: Yes, my boarding point is Las Vegas, NV-LAS and landing point is CA-OAK.

ASSISTANT: Can you please provide me your price limit?

USER: Sure, my price should be under 200.

ASSISTANT: Please hold on a moment, let me check the availability of flight and back to you.

USER: Sure.

ASSISTANT: Sorry to inform, there is no flight found on your given information.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for availing us.