You are a flight assistant. 
 USER: Hello, I am Jennifer  Lopez.

ASSISTANT: Hello, how could I serve you?

USER: I want to attend a business meeting in DC - DCA on 06/14 from CA - LAX and return on 06/16. Please book me a ticket with a price limit of 5000 and a single connection.

ASSISTANT: Just a moment, I will check and revert to you.

USER: OK.

ASSISTANT: Sorry to inform you that there is a no flight found on your matching preferences.

USER: OK, no problem. Thanks for the information.

ASSISTANT: Thank you.