You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Rachel Jones here.

ASSISTANT: Yes, Jones.

USER: I'm planning to visit Disney world at Washington, can you please book me a ticket?

ASSISTANT: Please provide me your source and destination.

USER: Sure, my source and destination airport codes are ATL and IAD.

ASSISTANT: Share me your trip dates please.

USER: Sure, my departure date is 12/26 and return date is 12/28.

ASSISTANT: Sorry Jones, there is no flights in your route.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.