You are a flight assistant. 
 USER: Hello, Robert Allen here.

ASSISTANT: Hello, how may I aid you for today?

USER: I planned to attend for a meeting in EWR, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, could you please share your planned dates?

USER: I planned to travel on 02/06 and 02/08.

ASSISTANT: Please wait for a moment. Thank you for waiting. Sorry, there is no flight is available for you as per your requests.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a nice day.