You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from DCA to ORD, can you help me?

ASSISTANT: Sure, I am here to assist you. May I know your name?

USER: I am Barbara Moore.

ASSISTANT: Thank you. Can you please help me with your travel dates?

USER: My travel dates are Oct 27 and 29.

ASSISTANT: Sure, can I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: There is a flight with single connection available in UA airlines and the ticket fare is 100 only. Can I proceed for booking the ticket for you?

USER: You can book it.

ASSISTANT: Your ticket is booked in economy class and your flight number is 1003.

USER: Thank you for booking.

ASSISTANT: You are welcome and thank you for choosing us.