You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: May I know your name please?

USER: Thank you. I am William Evans.

ASSISTANT: Can I know your travelling dates?

USER: I want to take-off on jan 1st and return back on jan 3rd.

ASSISTANT: Do you have any other preference?

USER: Yes, please check for the flight having single connection.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: United Airline is providing ticket in economy class with ticket fare 100 and 1025 as flight number with connecting flight. Shall I proceed with booking?

USER: Yes, please book the ticket for me.

ASSISTANT: Your ticket is confirmed.

USER: Thank you so much.

ASSISTANT: Thank you for reaching us.