You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Laura Williams.

ASSISTANT: How may I help you?

USER: I would like to travel from OAK to PHL.

ASSISTANT: Sure, could you please share your planned dates?

USER: My preferable dates are from 02/14 to 02/16.

ASSISTANT: Sorry, there is no flight is available for you.

USER: That's ok.

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

USER: Thank you.