You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to book flight ticket from ATL to IAD?

ASSISTANT: Sure, I am here to help you. Can you please share your travel dates?

USER: My travel dates are Dec 15 and Dec 17.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No more requirements.

ASSISTANT: May I know your name please?

USER: I am Gregory Lee.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.