You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Robert Thomas. I have to book a flight ticket  that I am unable to do, could you please help me in booking flight ticket on dates 12/14 and 12/16?

ASSISTANT: Sure, can I know your airport codes?

USER: Yes, my airport codes are CLT and ORD.

ASSISTANT: I found an economy class ticket in UA airlines with normal cost of 200 and it is a connecting flight. Can I book your ticket?

USER: Yes, please.

ASSISTANT: Your ticket is booked with flight 1004.

USER: Thank you.

ASSISTANT: Thank you, have a good day.