You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Elizabeth Barker. I am planning to book a ticket from CLT to LAX. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I am planning to travel on 06/15 and return back on 06/17.

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

USER: That's fine. Thank you for your service.

ASSISTANT: You are welcome.