You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to attend Fun fair in ATL. Can you please book me a flight ticket from IAD?

ASSISTANT: Sure, let me know your travelling dates.

USER: My preferable travel dates are from Jan 18 to Jan 20.

ASSISTANT: Please share your connection limit.

USER: I would like to prefer a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want to return in the evening flight.

ASSISTANT: May I know your name?

USER: My name is Barbara Walker.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.