You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you for the day?

USER: Can you please book a flight ticket from DCA to ATL?

ASSISTANT: Sure, I will help you with that. Can you please share your travelling dates?

USER: My travelling dates are May 31 and June 02.

ASSISTANT: May I know your name please?

USER: My name is Patrick Smith.

ASSISTANT: Can I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the evening.

ASSISTANT: Sorry to say that, there are no flights found on this route as per your travel dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us, have a great day.