You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I would like to visit Chicago, please book my flight ticket from DCA to ORD.

ASSISTANT: May I know your travel dates?

USER: I will depart on Dec 24th and return back on Dec 26th.

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: May I know your other specifications?

USER: I prefer for a normal-cost airline.

ASSISTANT: There is a connecting flight-1011 in business class, shall I proceed?

USER: Yes, please book the ticket for me.

ASSISTANT: Can I have your name?

USER: My name is Deborah Smith.

ASSISTANT: Your reservation is done on UA airlines. Thanks for choosing us.

USER: Thank you very much.