You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Minneapolis, please help me in booking a ticket from DCA to MSP.

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My planned travel dates are on Oct 02 and Oct 04.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preferences?

USER: No, I need to return in the afternoon.

ASSISTANT: Sorry there is no flight available for you as per your requests. May I know your name?

USER: Ok, no issues. Thank you for your help. My name is Brian Johnson.

ASSISTANT: Welcome.