You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is John Lopez.

ASSISTANT: How can I help you at this moment?

USER: I want to book a flight ticket from DEN to DCA. Can you help me in that?

ASSISTANT: Sure, may I know your travel dates please?

USER: My trip dates are Nov 13 to Nov 15.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know about your class preference?

USER: I don't have any class preference.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Let me know your depart and arrival timings.

USER: My return time should be in the evening.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Hawaiian airlines is providing you the connecting flight in economy class which departs at 0:00 AM and arrives at 23 PM. Shall I proceed?

USER: You can proceed.

ASSISTANT: Your ticket has been reserved with flight-1006.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.