You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Thomas.

ASSISTANT: How may I assist you?

USER: I would like to travel from DEN to ATL, can you please help me to book a flight ticket?

ASSISTANT: Sure, could you please help me with your planned travel dates?

USER: I prefer to travel on 12/09 and 12/11.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Thomas, I found a flight for you in UA airlines with fare 100. Can I book your ticket?

USER: Ok, please confirm my booking.

ASSISTANT: Ok, your booking is confirmed with flight number 1010.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.