You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket from ATL to DEN. Could you help me in booking?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are from May 06 - 08.

ASSISTANT: Do you have any specifications?

USER: I prefer for direct flight.

ASSISTANT: May I know your name?

USER: Jack Wilson.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok, thank you.

ASSISTANT: Thank you.