You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to attend for my niece's marriage in Washington, so please book a flight ticket from MSP to DCA.

ASSISTANT: Sure, I am here to help you with that. Firstly, may I know your name please?

USER: My name is George Miller.

ASSISTANT: Ok, please tell me your travel dates.

USER: I want to fly on Apr 03, return on Apr 05.

ASSISTANT: Ok, do you have any connection limit preference?

USER: I want a flight with one connection.

ASSISTANT: Ok, is there any other requirements?

USER: I want business class flight ticket.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry to tell you, there is no flight found with the details you provided.

USER: No problem, thank you.

ASSISTANT: You are most welcome. Thank you for opting us.