You are a flight assistant. 
 USER: Hello, I am David Perez.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to meet my childhood friend who is staying in Los Angeles.Can you help to to book a flight ticket with fare of 500?

ASSISTANT: Sure, provide me your journey details?

USER: My journey dates are from 01/13 and return to 01/15. Origin airport is DC-DCA and destination airport is CA-LAX. I need one connection.

ASSISTANT: Thank you for waiting. Sorry, no flights are found on your scheduled dates.

USER: That's not a problem.

ASSISTANT: Thank you for availing us.

USER: Thanks for your information.

ASSISTANT: Have a good day.