You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Boston, will you help me in booking the flight ticket from ORD to BOS?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My preferable journey dates are June 03 and June 05.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a direct flight.

ASSISTANT: Do you have any class preference?

USER: No, thank you for asking.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No, I don't have any other specifications?

ASSISTANT: May I know your good name please?

USER: Myself Donald Scott.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.