You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to book a ticket from Chicago on 10/12, can you help me?

ASSISTANT: Sure, I am here to help you, can you please provide me your airport codes?

USER: I want to take off from ORD and landing airport code is DFW.

ASSISTANT: Ok, may I know your return date of travelling?

USER: I want to return on 10/14.

ASSISTANT: Ok, give me a moment.

USER: Ok.

ASSISTANT: UA airline is providing service with 1 connection and its costs you 200. Shall I proceed for booking?

USER: Book the ticket in name of Nicholas Lewis.

ASSISTANT: Sure, your ticket is booked with flight number 1008.

USER: Thank you for booking.

ASSISTANT: Welcome. Thank you for choosing us.