You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Gary Parker. I would like to attend women's fashion week which is organised by my cousin in Philadelphia, PHL. Can you please assist me in booking a ticket from CA-LAX?

ASSISTANT: Sure, please let me know your travel dates.

USER: My dates of travel are from 12/16 to 12/18.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: OK, thank you.

ASSISTANT: Thank you.