You are a flight assistant. 
 USER: Hi, I am Charles Wilson.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket from AZ - PHX on 07/02 to CO - DEN. And my return date is 07/04.

ASSISTANT: Ok, let me check what flights are available for you.

USER: Ok,.

ASSISTANT: We found a UA airline with flight number 1021 and price of 100 available matching your particulars. Shall I book your ticket?

USER: Ok, you can.

ASSISTANT: Your ticket has been reserved. Thank you for choosing us.

USER: Ok, thanks for your service.