You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Michelle Johnson. I want to book a flight ticket from Boston, MA -BOS to spend my summer vacations in Chicago, IL - ORD.

ASSISTANT: Please provide me your planned travel dates.

USER: My departure day is 04/01, return day is 04/03.

ASSISTANT: May I know your connection limit?

USER: I want direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given details.

USER: No issue, thanks for your service.

ASSISTANT: Thank you for choosing us.