You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Stephen Parker. I would like to travel from DCA to MSP, can you please help me in flight booking?

ASSISTANT: Sure, I am very happy to help you with that, can you share me your journey dates?

USER: I want to fly on Mar 18, return on Mar 20.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: My depart time should be morning. And I need a connecting flight.

ASSISTANT: Sorry, no flights are available on your travel dates.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.