You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kathleen Nelson here.

ASSISTANT: How may I aid you at this moment?

USER: I want to book a flight ticket to Chicago as I need to attend a international business conference. Can you please support me in finding a flight from Washington DC-DCA?

ASSISTANT: Sure, I am blissful to help you.

USER: Thank you.

ASSISTANT: Could you please share your destination airport code?

USER: I want to land on IL-ORD.

ASSISTANT: Ok, when would you like me to book a flight ticket?

USER: I want to depart on 05/18. I intend to return on 05/20.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: Ok, can I know in  which class do your prefer to travel?

USER: I am  flexible with any class.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: We found a UA airline with fare of 100 and a halt in between the journey matches your schedule. Shall I proceed with this airline?

USER: You can proceed with booking.

ASSISTANT: Your ticket has been confirmed with flight number 1019.

USER: Thank you.

ASSISTANT: Thank you for choosing us.