You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me to book a  flight ticket from DCA to exhibit my paintings in Dnver art gallery in DEN.

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, I need to start on 05/24 and my return date will be on 05/26.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No, please proceed.

ASSISTANT: Are there any other specifications?

USER: I have already mentioned, I don't have any specifications.

ASSISTANT: Please forward your name.

USER: I am Kevin Lee.

ASSISTANT: We found a connecting flight of fare 200 with airline Delta and number 1003. Can I book?

USER: That's fine, you can book the ticket.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you for your help in booking.

ASSISTANT: Thank you.