You are a flight assistant. 
 USER: Hello, I am Gary Edwards.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to celebrate a Flower festival in New York, could you help me in booking a flight ticket from Washington?

ASSISTANT: Sure, please share me your planned journey date?

USER: I will start on 11/09, return on 11/11.

ASSISTANT: May I know your source and destination airport codes?

USER: My source and destination airport codes are DC - DCA, NY - LGA.

ASSISTANT: Do you need any halt in between the journey?

USER: Yes, I need a halt.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey data.

USER: No problem, thank you.

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