You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Jennifer Lopez.Can you please help me to book my ticket?

ASSISTANT: Sure, can you provide your country codes and travelling dates?

USER: I want to travel from OAK to LAX. My travelling dates are 08/12 and 08/14.

ASSISTANT: Sorry Jennifer, I didn't find any flight with your details.

USER: Ok, that's fine. Thank you for your help.

ASSISTANT: You are welcome.