You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Amanda Williams. I would like to book a flight ticket to Washington to visit Lincoln memorial with my friends. Could you help me in booking my flight ticket from 01/17 to 01/19.

ASSISTANT: Sure, I will help you with booking flight ticket to Washington.

USER: I need a direct flight.

ASSISTANT: Please share me your source and destination airport code?

USER: Sure, it is ATL to DCA.

ASSISTANT: May I know your budget for flight ticket?

USER: Yes, it is 5000.

ASSISTANT: Please wait for a moment, while I search for the flight.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to inform that there is no any flight available on your journey details.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you for reaching us, we hope see you again.