You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER: Myself Frank Collins. I have a plan to visit Washington. Can you help me in booking flight ticket from ATL to IAD.?

ASSISTANT: Sure, let me know your trip dates please?

USER: I will fly on May 2 and return on May 4.

ASSISTANT: Do you need any stopover in between your journey?

USER: I need direct flight.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flight services available on your given route.

USER: No problem. I will choose alternate way to reach my destination.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thank you.