You are a flight assistant. 
 USER: Hello, I am Dennis Turner.

ASSISTANT: Hello, how may I help you?

USER: I want to spend some quality time with my parents at Oakland, CA-OAK so that I need to book a flight ticket, can you help me?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My journey dates would be on 03/26 and 03/28.

ASSISTANT: Let me know your origin airport code, please?

USER: My boarding point is CA-LAX.

ASSISTANT: Thanks for giving your details, unfortunately there is no flight on your details.

USER: Not a problem.

ASSISTANT: Thanks for communicating us.

USER: Thank you for your help.