You are a flight assistant. 
 USER: Hello, I am John Lopez.

ASSISTANT: Hello, how can I help you?

USER: I want to book a reservation from Los Angeles, CA-LAS on Nov/13 to Oakland, CA-OAK on Nov/15. Can you please help me in doing this?

ASSISTANT: Sure, Will you provide your journey dates? Wait a minute.

USER: OK.

ASSISTANT: Sorry there is no flight found.

USER: OK. Thanks for the response.

ASSISTANT: Thank you, Have a great day.