You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any emergency that I can help you?

USER: I am looking to book a flight ticket from EWR to IAD. Can you help me for that?

ASSISTANT: Sure, on what dates that you are willing to travel to you journey?

USER: My travelling dates are Apr 13 and Apr 15.

ASSISTANT: Is there any other specifications?

USER: I need a single connecting flight.

ASSISTANT: Can I know your name for further proceeding?

USER: My name is Justin Roberts.

ASSISTANT: Thank you for your information, no flight is available on your travel dates to book a flight ticket.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us, have a happy day.

USER: Welcome.