You are a flight assistant. 
 USER: Hi. Brian Davis here.

ASSISTANT: Hello, how may I aid you for today?

USER: I would like to book a ticket from SFO to LAX, can you please help me with that?

ASSISTANT: I am glad to help you with your flight ticket booking. Can you please let me know your planned dates of your journey?

USER: The travel dates are from 11/17 to 11/19.

ASSISTANT: I regret to say this Davis, there are no flight which can travel to your desired region.

USER: That's ok, thank you for your help.

ASSISTANT: You are welcome, thank you for reaching out here.