You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Help me in booking a flight from IAD to ATL?

ASSISTANT: Sure, we are glad to help you. Can you please let me know your travelling dates?

USER: I like to travel on Apr 13 to 15.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I prefer direct flight.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: Please provide your good name.

USER: I am Donna Evans.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.