You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Dennis Jackson, can you help me to book a flight ticket to OAK on 11/16?

ASSISTANT: Can you please provide your source airport code and travelling dates?

USER: I am planning to start my journey from LAX. I would like to return on 11/18.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That is fine.

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

USER: Thank you for your help.