You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you out?

USER: I have a plan to meet my friend in Chicago, can you help me for booking a flight ticket from DCA to ORD?

ASSISTANT: Sure, please share your travelling dates.

USER: My travelling dates are Jan 26 and Jan 28.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications for you?

USER: My depart time is afternoon.

ASSISTANT: Thanks for providing details, there is a connecting flight found in Delta airline with a fare of 200 which departs at 3:00 AM and return at 15:00 PM. Shall I proceed for booking?

USER: I am looking to book a flight in business class.

ASSISTANT: Sorry, no flights are available on your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: May I know your good name for the documentation process?

USER: My name is Stephen Collins.

ASSISTANT: Thank you.

USER: Welcome.