You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Catherine Roberts. I am planning to visit Washington, can you please book me a ticket from ATL to IAD?

ASSISTANT: Your travelling dates please?

USER: My preferable journey dates are from 05/22 to 05/24.

ASSISTANT: Wait a moment please.

USER: Please search for direct flight on this route.

ASSISTANT: Ok, just  a moment please. I am sorry no flights found on your route.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you.

ASSISTANT: Thank you for choosing us.