You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Samuel Wilson. I want to book a flight ticket with a price limit of 1000 to Washington.

ASSISTANT: Ok, may I know your airport codes?

USER: I am planning to celebrate my son birthday in Capitol Hill Hotel in DC - DCA and my origin from CA - LAX.

ASSISTANT: Can you please provide me your planned journey dates?

USER: My departure is 11/12 and return date on 11/14.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your given dates.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thanks for opting us.