You are a flight assistant. 
 USER: Hi. I am Justin Walker.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit LAX to meet my school friend, can you please help me to book flight from DCA?

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

USER: Sure, my desired travel dates are Mar 16 and Mar 18.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a single connection flight.

ASSISTANT: Please share me your price limit.

USER: I can afford 5000.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to say that, no flights were found with your given details.

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

ASSISTANT: Thank you for reaching us.