You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you aid me to book a flight ticket from EWR to IAD?

ASSISTANT: Sure, can you share me your trip dates?

USER: My trip dates are Feb 11 and Feb 13 respectively.

ASSISTANT: Is there any specifications?

USER: I prefer for single connecting flight to travel.

ASSISTANT: May I know your good name?

USER: Angela King here.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No issue. Thanks for checking.

ASSISTANT: Thank you for opting us.